Parks v. AlliedSignal, Inc. ( 1997 )


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  •                                                                                                                            Opinions of the United
    1997 Decisions                                                                                                             States Court of Appeals
    for the Third Circuit
    5-14-1997
    Parks v. Alliedsignal Inc
    Precedential or Non-Precedential:
    Docket 96-3256
    Follow this and additional works at: http://digitalcommons.law.villanova.edu/thirdcircuit_1997
    Recommended Citation
    "Parks v. Alliedsignal Inc" (1997). 1997 Decisions. Paper 104.
    http://digitalcommons.law.villanova.edu/thirdcircuit_1997/104
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    Filed May 14, 1997
    UNITED STATES COURT OF APPEALS
    FOR THE THIRD CIRCUIT
    No. 96-3256
    EDITH J. PARKS, Individually, Personal Representative of
    the Estate of Leslie E. Parks, Deceased and as parent and
    next friend of Kori J. Parks
    v.
    ALLIEDSIGNAL, INC.; THE WARNER & SWASEY
    COMPANY; THE GRADALL COMPANY
    EDITH J. PARKS, Individually, As Personal Representative
    of the Estate of Leslie E. Parks, Deceased, and as parent
    and next friend of Kori J. Parks,
    Appellant
    On Appeal from the United States District Court
    for the Western District of Pennsylvania
    (D.C. No. 92-cv-02105)
    Argued: February 11, 1997
    BEFORE: GREENBERG, COWEN and McKEE,
    Circuit Judges
    (Filed May 14, 1997)
    L. Palmer Foret, Esq. (argued)
    Foret and Thompson
    1275 K Street, N.W.
    Suite 1101
    Washington, D.C. 20005
    Counsel for Appellant
    Edith J. Parks
    Michael D. Heintzman, Esq. (argued)
    Kenneth F. Klanica
    Heintzman, Warren & Weis
    707 Grant Tower
    Gulf Tower, 35th Floor
    Pittsburgh, PA 15219
    Counsel for Appellees
    AlliedSignal, Inc.
    The Gradall Company
    OPINION OF THE COURT
    COWEN, Circuit Judge.
    Edith J. Parks (Mrs. Parks) appeals from the April 1,
    1996, order of the United States District Court for the
    Western District of Pennsylvania denying her a new trial in
    a strict products liability tort action. She asserts that the
    district court erred in instructing the jury as to causation
    and contributory negligence, and in failing to take sufficient
    steps to ensure that defendants complied with discovery
    orders. We agree and will reverse and remand for a new
    trial.
    I.
    Mrs. Parks alleges that defective visibility features on
    AlliedSignal's Gradall G-600 excavating machine caused
    her husband's death. Leslie Parks (Mr. Parks) was a general
    laborer for Allegheny Sand, Inc. Mrs. Parks is his widow.
    Mr. Parks was killed while working with the Gradall
    machine, an excavator with two separate cabs that is used
    2
    for breaking boulders into smaller pieces. One cab is in the
    front, as in an ordinary truck, and is occupied by the driver
    of the vehicle. The second cab, at the rear, is attached to
    and controls the excavating arm.
    The second cab, the arm, and the arm's counterweight
    are all in one line. The counterweight keeps the machine
    from tipping when the arm is used off-center. When the
    second cab operator moves the arm as if tracing a circle,
    the machine's entire arm (including the counterweight)
    swings around a central point. The operator sits in the
    middle, swinging along with the arm. The operator's seat
    faces the excavating arm, and the counterweight swings out
    behind his back. The cab has no mirrors, so the operator
    has no view to the area behind him and only limited side
    visibility while operating the controls.
    On the morning of the accident, Mr. Parks and two co-
    workers, at the direction of their supervisor, endeavored to
    break some blocks of carbon. The machine's regular shovel
    had been replaced by Mr. Parks' employer with a chipper
    attachment used for carbon-breaking. From outside the
    machine, Mr. Parks directed his co-workers, who occupied
    the two cabs and controlled the truck. Alan McMunn,
    sitting in the front cab, drove the machine to the back of a
    shed where the carbon was stored. William Kline, in the
    second cab, operated the excavator arm and boom.
    Mr. Parks walked to the back of the shed. As McMunn
    pulled the machine into the shed, Mr. Parks directed him.
    Mr. Parks told Kline to swing the boom to the left. The
    instruction sent the excavating arm's counterweight on a
    collision course with Mr. Parks. Mr. Parks was pressed
    between the counterweight and the wall, causing his death.
    Mrs. Parks sought to hold AlliedSignal liable on the
    theory that it failed to install a rear-view mirror or
    alternative safety device on the Gradall machine. She
    alleged that this omission made the product "unreasonably
    dangerous" because it caused the vision of the second cab's
    operator to be needlessly circumscribed. Over objections by
    Mrs. Parks, the district court admitted evidence concerning
    Mr. Parks' conduct immediately prior to his death. The
    district court refused to charge the jury that Mr. Parks'
    3
    conduct could be viewed as a legal cause of his death only
    if it were unforeseeable.
    The jury found that the product was indeed defective, but
    nevertheless returned a verdict for the manufacturer. The
    verdict was presumably based on the finding of the jury
    that the defect was not "a substantial factor" in causing the
    death. Parks' motion for a new trial was denied. Mrs. Parks
    argues that the district court erred when it failed to charge
    the jury that if Mr. Parks' conduct were foreseeable, such
    conduct could not have broken any chain of causation
    linking the alleged defect to his death.
    In addition, during the trial Mrs. Parks sought to compel
    disclosure of information that she had requested during
    pre-trial discovery, but which allegedly had not been
    divulged. That information concerned other accidents
    involving similar machines and the placement of mirrors on
    those machines. The district court granted the motion to
    compel,1 but the record on appeal raises serious questions
    as to whether defendants properly complied with discovery
    orders.
    II.
    The district court exercised jurisdiction pursuant to 
    28 U.S.C. § 1332
     (1993), diversity of citizenship. We have
    jurisdiction over this appeal pursuant to 
    28 U.S.C. § 1291
    (1993). Concerning the propriety of the charge delivered to
    the jury, our standard of review is plenary, as we are
    reviewing whether the district court erred in formulating a
    legal precept. See Hook v. Ernst & Young, 
    28 F.3d 366
    , 370
    (3d Cir. 1994)(citing Griffiths v. CIGNA Corp., 
    988 F.2d 457
    ,
    462 (3d Cir. 1993)(citing Rotondo v. Keene Corp, 
    956 F.2d 436
    , 438 (3d Cir. 1992))). We review the supervision of
    discovery by the district court for abuse of discretion. See
    United States v. 27.93 Acres of Land, 
    924 F.2d 506
    , 510 (3d
    Cir. 1991); Marroquin-Manriquez v. INS, 
    699 F.2d 129
    , 134
    (3d Cir. 1983).
    _________________________________________________________________
    1. App. at 528-531.
    4
    III.
    We initially review two key questions raised on this
    appeal. First, what must a plaintiff show in order to recover
    in a strict products liability tort action under Pennsylvania
    law, which incorporates section 402A of the Restatement
    (Second) of Torts? Second, having admitted evidence of a
    decedent's conduct immediately before an accident, what
    must a district court do to fulfill its obligation to explain to
    a jury the appropriate use of such information?
    A. Section 402A
    Section 402A, which was adopted by the Supreme Court
    of Pennsylvania in Webb v. Zern, 
    220 A.2d 853
    , 854 (Pa.
    1966), "imposes strict liability for injuries caused by
    defective product design."2 Pacheco v. Coats Co., Inc., 
    26 F.3d 418
    , 421 (3d Cir. 1994)(citing Lewis v. Coffing Hoist
    Div., Duff-Norton Co., 
    528 A.2d 590
    , 592 (Pa. 1987)). See
    also Phillips v. A-Best Products Co., 
    665 A.2d 1167
    , 1170
    (Pa. 1995)(acknowledging Pennsylvania's adoption of
    section 402A). In the words of the Pennsylvania Supreme
    Court, "Section 402A . . . requires only proof that a product
    was sold in a defective condition unreasonably dangerous
    _________________________________________________________________
    2. Section 402A provides:
    (1) One who sells any product in a defective condition
    unreasonably dangerous to the user or consumer or to his property
    is subject to liability for physical harm thereby caused to the
    ultimate user or consumer, or to his property, if
    (a) the seller is engaged in the business of selling such a
    product, and
    (b) it is expected to and does reach the user or consumer without
    substantial change in the condition in which it is sold.
    (2) The rule stated in Subsection (1) applies although
    (a) the seller has exercised all possible care in the preparation
    and sale of his product, and
    (b) the user or consumer has not bought the product from or
    entered into contractual relations with the seller.
    RESTATEMENT (SECOND) OF TORTS § 402A (1965).
    5
    to the user or consumer, and that the defect was the
    proximate cause of plaintiff's injuries." Walton v. Avco
    Corp., 
    610 A.2d 454
    , 458 (Pa. 1992). "Manufacturers are
    held as guarantors upon a finding of defect and causation."
    
    Id. at 462
    .
    In order to prevail in a section 402A action, the plaintiff
    must show that a product is "unreasonably dangerous to
    intended users for its intended use." Pacheco, 
    26 F.3d at 422
     (emphasis omitted). In interpreting the phrase
    "intended use", we have held that "the intended use of a
    product ``includes all those [uses] which are reasonably
    foreseeable to the seller.' " 
    Id.
     (quoting Sheldon v. West
    Bend Equip. Corp., 
    718 F.2d 603
    , 608 (3d Cir.
    1983)(alteration added)). Under the strict liability test,
    therefore, a defendant is liable for causing injury to a
    person who was behaving in a foreseeable manner. This
    principle is reflected in the jury instruction recommended
    by Pennsylvania's Committee for Proposed Standard Jury
    Instructions, which the Pennsylvania Supreme Court
    endorsed in Azzarello v. Black Bros. Co., Inc.:
    The product must . . . be provided with every element
    necessary to make it safe for [its intended] use, and
    without any condition that makes it unsafe for [its
    intended] use. If you find that the product, at the time
    it left the defendant's control, lacked any element
    necessary to make it safe for [its intended] use or
    contained any condition that made it unsafe for[its
    intended] use, then the product was defective, and the
    defendant is liable for all harm caused by such defect.
    
    391 A.2d 1020
    , 1027 n.12 (Pa. 1978). See also Lewis v.
    Coffing Hoist Div., Duff-Norton Co., 
    528 A.2d 590
    , 593 (Pa.
    1987).
    1. Foreseeability
    Section 402A liability cannot be found if, at the time of
    the accident, the product was being used in an
    unforeseeable manner. The requirement of foreseeability
    therefore enables strict liability to exist without
    transforming manufacturers into absolute insurers of their
    products. The importance of this rule has been repeatedly
    6
    demonstrated in the courts. In Sheldon, 
    718 F.2d at 608
    ,
    we held that "the district court[ ][should not] fail[ ] to
    instruct the jury to the effect that the intended use of a
    product includes any use which is reasonably foreseeable
    to the seller." See also Schell v. AMF, Inc., 
    567 F.2d 1259
    ,
    1263 (3d Cir. 1977)(quoting Kuisis v. Baldwin-Lima-
    Hamilton Corp., 
    319 A.2d 914
    , 921 n.13 (Pa.
    1974))("whether a particular use of a product is abnormal
    depends on whether the use was reasonably foreseeable by
    the seller."). In Eck v. Powermatic Houdaille, 
    527 A.2d 1012
    ,
    1019 (Pa. Super. 1987), the Superior Court of Pennsylvania
    reversed a trial court on the grounds that "the established
    rule of law . . . requires consideration of ``foreseeability' " in
    the jury instruction in a strict products liability action.
    The concept of foreseeability is relevant to strict products
    liability cases for the purpose of determining whether the
    use that was made of a product at the time of the accident
    was one that the manufacturer could have reasonably
    anticipated. See Schell, 
    567 F.2d at 1263
    . In order to
    prevail in a section 402A products liability action, then, the
    plaintiff must show that: (1) a product defect (2) caused a
    harm (3) while the product was being used in a foreseeable
    manner.
    As the Pennsylvania Superior Court held in Sweitzer v.
    Dempster Sys., 
    539 A.2d 880
    , 882 (Pa. Super. 1988)(citing
    Salvador v. Atlantic Steel Boiler Co., 
    319 A.2d 903
    , 907 (Pa.
    1974)(emphasis added)):
    The role of foreseeability in a product liability case is
    consistent with the broad and sound social policy
    underlying § 402A; that is, as between an innocent
    user of a product and a manufacturer or seller who is
    engaged in the business of manufacturing or selling a
    product, risk of loss for injuries resulting from the use
    of a defective product shall be borne by the
    manufacturer and/or seller.
    Of course, a defect may produce manufacturer liability in a
    given case only when the harm caused is of the type
    threatened by the defect.
    7
    2. "Substantial Factor" Causation as it Relates to
    Foreseeability
    In determining how the elements of foreseeability and
    causation may properly be demonstrated in the instant
    case, we are again guided by Pennsylvania law. When
    addressing causation, Pennsylvania has rejected the "but
    for" test and adopted the "substantial factor" test as
    embodied in the Restatement (Second) of Torts § 431, which
    provides:
    The actor's negligent conduct is a legal cause of harm
    to another if: (a) his conduct is a substantial factor in
    bringing about the harm, and (b) there is no rule of law
    relieving the actor from liability because of the manner
    in which his negligence resulted in the harm.
    See Trude v. Martin, 
    660 A.2d 626
    , 632 (Pa. Super.
    1995)(citing Whitner v. Von Hintz, 
    263 A.2d 889
     (Pa. 1970)).
    The courts of other states following the Restatement have
    defined a "substantial factor" as one that is not "merely
    negligible." ACandS v. Asner, 
    686 A.2d 250
    , 260 (Md.
    1996). "Stated differently, ``[l]iability attaches not only to the
    dominating cause but also to any cause which constitutes
    at any event a substantial factor in bringing about the
    injury.' " Dawson v. Bunker Hill Plaza Assocs., 
    673 A.2d 847
    , 853 (N.J. Super. App. Div. 1996)(quoting Peer v. City
    of Newark, 
    176 A.2d 249
     (N.J. Super. App. Div.
    1961)(emphasis added)). The substantial factor test has
    replaced the "but for" causation test in strict liability
    contexts precisely because in design defect cases it is
    typically a matter of speculation whether the presence of a
    safety device would, in a given instance, have actually
    prevented a harm. See Yukon Equip., Inc. v. Gordon, 
    660 P.2d 428
    , 433 (Alaska 1983)(stating that "but for" causation
    jury instruction was improper in manufacturer's design
    defect case), overruled on other grounds, Williford v. L.J.
    Carr Invs., Inc., 
    783 P.2d 235
     (Alaska 1989).
    Our review of Pennsylvania law dictates that a plaintiff's
    conduct may be introduced to undermine a plaintiff's claim
    that the defect caused his accident only insofar as the
    plaintiff's conduct was unforeseeable to the defendant,
    even where the plaintiff played some part in setting the
    8
    accident in motion. Evidence concerning a decedent's
    possible role in bringing about his or her own death is
    admissible only to support defendant's claim that the
    conduct was so "extraordinary" or "[un]foreseeable" that it
    would be unjust to hold the defendant liable for the harm.
    See. e.g., Holloway v. J.B. Sys., Ltd., 
    609 F.2d 1069
    , 1074
    (3d Cir. 1979). When courts admit such testimony, they
    must elucidate the limited permissible uses of that
    evidence, as it is highly susceptible to misinterpretation by
    the jury.
    In determining causation, therefore, the task of the jury
    is not simply to determine whether the plaintiff played a
    part in causing the accident. Rather, the threshold question
    is whether the plaintiff's actions were foreseeable. As noted
    above, the manufacturer is responsible for making the
    product safe for all foreseeable uses. Decorative Precast
    Stone Erectors, Inc. v. Bucyrus-Erie Co., 
    493 F. Supp. 555
    ,
    557 (W.D. Pa. 1980), aff'd, 
    642 F.2d 441
     (3d Cir. 1981),
    informs us that under Pennsylvania products liability law,
    if both a manufacturer's defect and a plaintiff's conduct are
    found to be proximate causes, the plaintiff will recover
    unless the defendant meets the burden of proving that
    plaintiff's conduct was so unforeseeable as to constitute a
    superseding cause. See infra, Sec. III.A.3. If foreseeable, the
    jury must find for the plaintiff unless it finds that the defect
    did not play even a substantial, or more than negligible,
    role in causing the plaintiff's injury. In Schell, 
    567 F.2d at
    1263 (citing Barkewitch v. Billinger, 
    247 A.2d 603
    , 605)(Pa.
    1968)), we explained that recovery is allowed where the
    absence of a safety device caused an injury of the type that
    could be expected from the foreseeable use of the product.3
    _________________________________________________________________
    3. The dissent writes that
    The result the majority reaches does not take into account the
    distinction in Pennsylvania law between treatment of a plaintiff's
    negligence which is the sole cause of the injury and a plaintiff's
    negligence which combines with the defect in the product to cause
    the injury. Negligence of the second kind could defeat the claim only
    if it is . . . unforeseeable.
    Dissent at 29. The instant case is precisely of the second type: the jury
    explicitly answered yes to the question, "Was the Gradall excavator
    9
    The element of causation, while required, is not the
    primary focus of section 402A cases. Causation may be
    shown by process of elimination or circumstantial evidence.
    In cases dealing with product malfunction, for instance,
    Pennsylvania appellate courts have consistently reversed
    trial courts for not sending to the jury cases in which
    causation had not been directly demonstrated. See, e.g.,
    Ducko v. Chrysler Motors Corp., 
    639 A.2d 1204
     (Pa. Super.
    1994); Agostino v. Rockwell Mfg. Corp., 
    345 A.2d 735
     (Pa.
    Super. 1975); Burchill v. Kearney-Nat'l Corp. v.
    Pennsylvania, 
    468 F.2d 384
     (3d Cir. 1972). Similarly, in
    MacDougall v. Ford Motor Co., 
    257 A.2d 676
    , 680 (Pa.
    Super. 1969) overruled on other grounds, REM Coal Co. v.
    Clark Equip. Co., 
    563 A.2d 128
    , 134 (Pa. Super. 1989),4 the
    Pennsylvania Superior Court stated:
    The evidentiary requirements of negligence law demand
    proof that injury is proximately caused by a specific
    defect in design or construction because liability hinges
    upon whether the accident could have been avoided by
    the exercise of reasonable care. In contrast, the
    _________________________________________________________________
    defective at the time it was manufactured and sold?" App. at 432. The
    machine's defect was impaired visibility of precisely the area in which
    the accident occurred. In accordance with the dissent's above
    description, the manufacturer of the defective product in this case
    should be held liable unless the plaintiff's actions were unforeseeable.
    See also the criticism of Foley articulated in Dillinger, discussed infra in
    this opinion at 14-16. The dissent points out that the jury responded
    "no" to the question, "Was the defect in the excavator a substantial
    factor in bringing about Mr. Parks' death?" Dissent at 32. But our
    holding today is that the jury instructions did not properly illuminate,
    inter alia, what constitutes a substantial factor in a strict products
    liability action, so this question was not adequately explained to the jury.
    Having found that the Gradall machine was defective, the jury could
    have found that the defect was not a substantial factor in causing
    plaintiff's injury only if it found that had the mirror been in place, the
    driver would not have glanced into it before backing. Only in this sense
    does causation remain a factor susceptible to dispute. As this is a strict
    products liability action, the plaintiff's foreseeable actions remain
    immaterial to the question of causation.
    4. We note that the dissent does not address these cases.
    10
    concern of both section 402A and warranty law is with
    the fitness of the product.
    The de-emphasis of causation is a natural corollary of the
    distinction between negligence and strict products liability.
    In strict products liability, the focus is on whether the
    product was sold in an unreasonably dangerous condition
    for reasonably foreseeable uses. See Carpenter v. Koehring
    Co., 
    391 F. Supp. 206
    , 210-211 (E.D. Pa. 1975), aff'd, 
    527 F.2d 644
     (3d Cir. 1976). In negligence, by contrast, the
    focus is on whether a duty of care was breached. See
    Kuisis, 319 A.2d at 920. In either negligence or strict
    products liability, proximate cause defines "such limits on
    recovery as are economically and socially desirable." Klages
    v. General Ordnance Equip. Corp., 
    367 A.2d 304
    , 313 (
    240 Pa. Super. 1976
    ). In the products liability area,
    Pennsylvania has determined that it is economically and
    socially desirable to hold manufacturers liable for accidents
    caused by their defective products, without introducing
    negligence concepts of comparative fault that would weigh
    the manufacturer's negligent conduct against that of the
    injured product user. See Walton, 610 A.2d at 462. See also
    infra, Sec. III.A.4.
    3. Superseding or Intervening Cause
    The test for what constitutes a superseding cause reflects
    the de-emphasis of causation in strict products liability
    litigation. Klages explains that a reasonably foreseeable
    intervening act cannot "satisfy the requirements of a
    superseding cause."5 367 A.2d at 313. In a section 402A
    strict liability tort claim such as that in the instant case, "a
    _________________________________________________________________
    5. The RESTATEMENT (SECOND) OF TORTS § 440 defines superseding cause as
    "an act of a third person or other force which by its intervention prevents
    the actor from being liable for harm to another which by its antecedent
    negligence is a substantial factor in bringing about." Superseding cause
    (and the related intervening cause, defined in section 441) is a
    comparative negligence concept, whereby an actor's liability is
    diminished due to the injured party's own negligence. In order to be
    compatible with strict products liability, the concept must be
    substantially narrowed to eliminate any foreseeable conduct of the
    injured party.
    11
    negligent intervening act, to relieve defendant of
    accountability, must be . . . ``so extraordinary as not to have
    been reasonably foreseeable.' " Eshbach v. W.T. Grant's and
    Co., 
    481 F.2d 940
    , 945 (3d Cir. 1973)(quoting Dorsey v.
    Yoder Co., 
    331 F. Supp. 753
    , 764 (E.D. Pa. 1971)(quoting
    Wilson v. American Chain and Cable Co., 
    364 F.3d 558
    , 562
    (3d Cir. 1966))). Similarly, in Baker v. Outboard Marine
    Corp., 
    595 F.2d 176
    , 182 (3d. Cir. 1979), we held that the
    intervening negligence of a third party could serve as a
    superseding cause of injuries to shield defendant
    manufacturer from liability to plaintiff only if it were "so
    extraordinary as not to have been reasonably foreseeable."
    
    Id. at 182
     (quoting Eshbach, 
    481 F.2d at 945
    ). See also
    Williford, 783 P.2d at 237 (act may constitute superseding
    cause only if, in addition to being unforeseeable by
    defendant, it was highly extraordinary).
    In short, even if an intervening but foreseeable action is
    responsible for the major share of a strict products liability
    injury, that action cannot ordinarily be held to be the legal
    cause of the injury. Instead, it is removed from the picture,
    and liability attaches to the remaining causal actor or
    actors. Here, if the possibility of a person standing in the
    path of the Gradall is found to be foreseeable or ordinary,
    Mr. Parks' actions cannot legally be viewed as disrupting or
    otherwise playing a part in the causal chain that
    culminated in his death.
    4. Rejection of Comparative Fault
    The above-described approaches to foreseeability,
    causation, and superseding cause in Pennsylvania strict
    products liability cases are compelled by Pennsylvania's
    rejection of comparative fault. Of particular relevance to the
    instant case, Walton explained that
    [The Pennsylvania Supreme] Court has continually
    fortified the theoretical dam between the notions of
    negligence and strict "no fault" liability. It would serve
    only to muddy the waters to introduce comparative fault
    into an action based solely on strict liability.
    610 A.2d at 462 (citations omitted)(emphasis added). It has
    been noted by numerous courts that "[t]he Pennsylvania
    12
    Supreme Court, perhaps more than any other state
    appellate court in the nation, has been emphatic in
    divorcing negligence concepts from product-liability
    doctrine." Kern v. Nissan Indus. Equip. Co., 
    801 F. Supp. 1438
    , 1440 (M.D. Pa. 1992)(quoting Conti v. Ford Motor Co.,
    
    578 F. Supp. 1429
    , 1434 (E.D. Pa. 1983), rev'd on other
    grounds, 
    743 F.2d 195
     (3d Cir. 1984)).
    The Pennsylvania Supreme Court recently explained its
    reasons for not extending the defense of comparative
    negligence to a strict products liability action:
    Our position is not based solely on the problem of the
    conceptual confusion that would ensue should
    negligence and strict liability concepts be commingled,
    although that concern is not negligible. Rather, we
    think that the underlying purpose of strict product
    liability is undermined by introducing negligence
    concepts into it. Strict product liability is premised on
    the concept of . . . liability for casting a defective
    product into the stream of commerce.
    The deterrent effect of imposing strict product
    liability standards would be weakened were we to allow
    actions based upon it to be defeated, or recoveries
    reduced by negligence concepts.
    Kimco Dev. v. Michael D's Carpet Outlets, 
    637 A.2d 603
    ,
    606-607 (Pa. 1993)(emphasis added).
    Similarly, in McCown v. Int'l Harvester Co., 
    342 A.2d 381
    (Pa. 1975), the plaintiff, as here, was injured by an
    industrial vehicle. According to the plaintiff, the machine's
    design was defective and caused his injuries. The defendant
    argued that plaintiff's contributory negligence should have
    been considered either to reduce the plaintiff's permissible
    recovery or as a defense to liability. The Pennsylvania
    Supreme Court disagreed, explaining that it would be
    unwise to "create a system of comparative assessment of
    damages for 402A actions." 
    Id. at 382
    .
    Pennsylvania's wish to avoid "muddy[ing] the waters"
    dictates that in discussing causation, the comparative fault
    of the parties involved is immaterial. Rather, the focus is
    again on whether the activity engaged in by the plaintiff
    13
    was foreseeable. If foreseeable, and the defect is found to
    have been a cause of the injury, the plaintiff's actions
    cannot preclude defendant liability. Any other approach
    would require weighing negligence or lack of care, which
    would inject comparative fault into strict products liability.
    In Dillinger v. Caterpillar, Inc., 
    959 F.2d 430
     (3d Cir.
    1992), which undertook an extensive survey of
    Pennsylvania products liability law, the trial court's final
    charge expressly permitted the jury to consider plaintiff's
    alleged negligence when determining whether defendant's
    product caused his injuries: "The defendant denies that it
    is liable for plaintiff's injuries. Defendant contends that the
    773 truck was not defectively designed, and that any
    injuries sustained by plaintiff were caused by the acts of
    plaintiff himself." 
    959 F.2d at 440
    . In Dillinger, we reversed,
    disapproving this jury charge because we found that it
    "effectively framed the issue as one of contributory
    negligence . . . ." 
    Id.
     at 440 n.18. The defendant "point[ed]
    to a line of cases which suggest[ ] that, although evidence
    of a plaintiff's contributory negligence is ordinarily
    inadmissible, it is admissible to rebut the ``causation' prong
    of a products liability claim." 
    Id. at 441
    .
    We rejected the defendant's arguments and found the
    line of cases cited to be "in some instances[irreconcilable]
    with the Pennsylvania Supreme Court's declarations on this
    subject." 
    Id. at 441
    . We also distinguished that line of cases
    from the case then before us, by explaining that in the
    cases cited by the defendant, "the plaintiff's conduct [had]
    actively contributed to the cause of the accident, [rather
    than] merely [failing] to prevent the accident attributable to
    the defect." 
    Id. at 442
    . We reasoned in Dillinger that the
    evidence of the plaintiff's conduct was especially
    inadmissible when the conduct was "merely insufficient to
    prevent the accident attributable to the defect." 
    Id.
     In
    Dillinger, therefore, we left open the question of whether a
    different result would obtain where the plaintiff's conduct
    had been more than "merely insufficient to prevent the
    accident attributable to the defect." 
    Id.
    The argument of the defense in the instant case--that a
    plaintiff's foreseeable conduct can break the causal chain
    set in motion by a product defect--was championed in
    14
    Foley v. Clark Equip. Co., 
    523 A.2d 379
     (Pa. Super. 1987).
    But as we stated in Dillinger and reiterate today, we believe
    that case is inconsistent with Pennsylvania strict products
    liability law. Dillinger, 
    959 F.2d at 443
    . In Foley, the
    Superior Court endorsed the admission of evidence of a
    plaintiff's contributory negligence in a section 402A suit.
    There, as here, the plaintiff was struck by an industrial
    vehicle when the operator failed to notice him. The plaintiff
    alleged that the manufacturer had defectively designed the
    vehicle in that, inter alia, the driver's view was improperly
    obstructed. The Superior court stated that "negligen[t]
    conduct is admissible where it is relevant to establish
    causation[,]" and plaintiff's allegedly negligent behavior is
    admissible for this purpose. Foley, 523 A.2d at 393.
    Nonetheless, we explained in Dillinger that
    there is no meaningful way to reconcile the view that a
    plaintiff's negligence of the type involved in Foley
    should be admitted to undercut causation with the
    Supreme Court's prohibition of the introduction of a
    plaintiff's negligence to defeat liability. . . . In Foley,
    the plaintiff did not observe the oncoming forklift and
    did not move out of its way. Because the driver
    similarly had not noticed the plaintiff, the driver
    crashed into him. Although the plaintiff contended that
    the design of the forklift . . . was defective because, in
    part, . . . [of the] obstructed . . . view, the court
    permitted the defendant to introduce evidence of the
    plaintiff's inattention because the accident could have
    been avoided if the plaintiff had not acted negligently.
    . . . [T]here is no principled reason to prohibit evidence
    of the plaintiff's negligence in McCown but permit
    evidence of an almost identical character in Foley.
    
    959 F.2d at 443-44
    . The fact that the plaintiff in Foley
    could have moved out of the way does not mean that Foley
    caused the accident, and that the driver (who also could
    have moved out of the way) did not cause the accident.
    Obstructed vision was a proximate cause of plaintiff's
    injuries in Foley; no meaningful distinction can be made
    between the operator's and the plaintiff's roles in causing
    the accident.
    15
    In Dillinger, although we did not endorse as dispositive
    the distinction between plaintiffs who "set [their] accident[s]
    in motion" and those who merely fail to stop them, we
    limited our holding to cases in which the plaintiff merely
    failed to stop his injury from being caused by a product
    defect. 
    959 F.2d at 444
    . This distinction is somewhat
    artificial, as plaintiff's conduct will often be susceptible to
    characterization in either category. But assuming that in
    directing the operator to swing the boom, Mr. Parks "set the
    accident in motion," we will now address the question of
    the permissible uses of evidence of plaintiff's conduct
    where such conduct has actively "set the accident in
    motion." 
    Id.
    Based on the foregoing discussion of the permissible uses
    of plaintiff's conduct evidence in section 402A actions, we
    find that the evidence of Mr. Parks' actions preceding his
    death were appropriate for the jury to consider only if they
    decided that those actions were not reasonably foreseeable
    or were otherwise extraordinary. In failing to put that test
    to the jury, the district court gave the impression that the
    jury's function was to assess the relative contributions of
    Mr. Parks and the machine's defect in causing Mr. Parks'
    death. As a matter of law, however, strict products liability
    demands that a plaintiff's foreseeable actions can never
    displace manufacturer liability when a product defect was
    a substantial factor in causing the plaintiff's injury.
    B. Jury Instructions
    When reviewing the sufficiency of jury instructions, our
    task is to determine whether the "instruction was capable
    of confusing and thereby misleading the jury." Bennis v.
    Gable, 
    823 F.2d 723
    , 727 (3d. Cir. 1987)(quoting United
    States v. Fischbach & Moore, Inc., 
    750 F.2d 1183
    , 1195 (3d
    Cir. 1984)). Defendants contend that the district court's
    instructions were sufficient. But the several pages of
    sometimes contradictory instructions nowhere state that
    the jury must not consider the foreseeable or ordinary uses
    of a product to be a legal cause of an accident, in the sense
    that foreseeable actions cannot limit a defendant's liability.
    The actions of Mr. Parks may be weighed in the causation
    calculation only if the jury finds them to have been
    16
    unforeseeable or extraordinary. Omission of this
    requirement is a clear violation of our holding in Sheldon,
    
    718 F.2d at 608
     ("On remand . . . the district court should
    . . . charge the jury that the intended use of a product
    includes all those [uses] which are reasonably foreseeable
    to the seller.").
    Furthermore, our holding in Baker demonstrates that
    instructions that contain some characterizations of the law
    that are accurate will nonetheless be unacceptably tainted
    by the presence of other, misleading comments:
    The district court stated in its opinion denying the new
    trial motion that its instruction that there may be more
    than one proximate cause, and that Outboard would
    be liable if a defect [were] "[a] proximate cause,"
    adequately informed the jury that it could find[the
    defendant] to be negligent, and further find her
    negligence to be . . . ``a' proximate cause[,] was greatly
    diminished [by other instructions]. . . . .[T]he case will
    be remanded for a new trial.
    Baker, 
    595 F.2d 176
    , 184 (citation omitted).
    In Eshbach, we reversed the district court because it
    failed to either "remove the question of [third-party]
    negligence entirely from the case or, if it was to be
    considered, to instruct the jury as to the limits of its
    application." 
    481 F.2d at 945
    . Strict liability means that an
    entity is liable for all accidents caused unless they are
    extraordinary or unforeseeable, regardless of the level of
    vigilance demonstrated by others.
    In the present case, the district court's instructions to
    the jury spread over several pages of the transcript, and the
    summary of the instructions offered at the end misstated
    the appropriate analysis. The district court accurately
    stated,
    if you find that a defect in a product was a substantial
    factor in bringing about harm, the manufacturer
    and/or seller of the product is responsible for that
    harm even though you may have found that there were
    other substantial factors as well as a defect in bringing
    about the harm.
    17
    App. at 414-15. But the district court impermissibly
    blurred the matter in summarizing the instructions:
    If you determine that the defendants manufactured
    and sold the excavator lacking an element necessary to
    make it safe for its intended use and that the lack of
    this element or elements was a substantial factor in
    bringing about the incident which resulted in Mr.
    Parks' death, then you will find that the defendants are
    liable to the plaintiff. Otherwise, you will find in favor
    of the defendants. Likewise, your verdict will be for
    defendants if you find that either the conduct of the
    decedent's employer . . . was a legal cause of the
    accident or if you find that the conduct of Mr. Parks
    himself or the conduct of his co-workers was also a
    legal cause of the accident and that the alleged defect
    was not a legal cause of the accident.
    So, in order to find for the defendants, you must find
    that the alleged defect was not the legal cause of the
    accident.
    App. at 418-19 (emphasis added). Here, in concluding, the
    court instructed that the defendant will prevail if "you . . .
    find . . . that the alleged defect was not the legal cause of
    the accident." The use of "the" rather than "a" indicated
    that the legal cause must be predominant, or greater than
    all others, rather than one of several, of varying (albeit
    "substantial") weights.
    As noted above, the primary reason that the instruction
    is fatally erroneous is not its particular wording but that it
    failed to require the jury to analyze whether Mr. Parks'
    actions were unforeseeable or extraordinary. If the jury
    found that the actions were neither unforeseeable nor
    extraordinary, it could not have found his actions to be "a
    legal cause" of his injury. Yet in the above-quoted
    instruction, the court indicated that Mr. Parks' conduct
    could be a "legal cause of the accident" without explaining
    that this was true only if the conduct were extraordinary or
    unforeseeable.
    The centrality of foreseeability to Pennsylvania strict
    products liability law was recently reaffirmed in Childers v.
    Power Line Equip. Rentals, Inc., 
    681 A.2d 201
    , 208-209 (Pa.
    18
    Super. 1996), which held that evidence of an injured party's
    conduct was properly barred from a strict liability action
    because the defendant had failed to demonstrate that the
    injured party acted in an "unforeseeable," "reckless,"
    "extraordinary," or "outrageous" manner. Here, having
    admitted evidence of plaintiff's conduct, the district court is
    obligated firmly to instruct the jury that a plaintiff's
    comparative fault is no defense to defendant liability, and
    should not be weighed against the manufacturer's alleged
    defect as a potential cause of the injury.
    IV.
    We now shift our focus from the jury instructions at trial
    to the discovery process. It appears that defendants did not
    produce discovery information concerning other similar
    accidents, of which there were at least five. Defendants
    concede that all information on these five other accidents
    came from the investigation conducted by plaintiff, and was
    not disclosed by defendants in discovery. AlliedSignal
    introduced specific information about these accidents only
    at trial, when arguing that evidence of their occurrence
    should be inadmissible. In addition, the record contains
    credible evidence that defendants failed to reveal the
    existence of safety mirrors on comparable machines,
    including the Gradall 880-C.
    These apparent discovery abuses did not become evident
    until trial. While we make no definitive assessments as to
    the propriety of defendants' actions, on retrial the district
    court is directed to superintend with care and be confident
    that defendants properly and adequately disclose materials
    to which the plaintiff is rightfully entitled. Specifically,
    discovery orders that the court entered in the original trial,
    and which apparently were not heeded in full, shall be
    zealously policed by the district court.
    V.
    For the reasons stated above, we will reverse the district
    court's April 1, 1996, denial of appellants' motion for a new
    trial and remand for a new trial.
    19
    McKEE, Circuit Judge, concurring:
    I join Judge Cowen's opinion. However, I write separately
    to state my understanding of what we hold today, and to
    comment upon the problems I perceive in the approach
    taken by our colleague, Judge Greenberg. In my view, that
    approach opens the door that the Pennsylvania Supreme
    Court closed in Azzarello v. Black Brothers, Co., 
    391 A.2d 1020
     (Pa. 1978), and beckons comparative fault to reenter
    discussions of strict liability. Any discussion of strict
    liability must adhere to the policy considerations endemic
    to § 402A of the Second Restatement of Torts. As we noted
    in Dillinger v. Caterpillar, Inc., 
    959 F.2d 430
     (3d Cir. 1992)
    in our discussion of Berkebile v. Brantly Helicopter Corp.,
    
    337 A.2d 893
     (1975):
    The law of products liability developed in response to
    changing societal concerns over the relationship
    between the consumer and the seller of a product. The
    increasing complexity of the manufacturing and
    distributional process placed upon the injured plaintiff
    a nearly impossible burden of proving negligence
    where, for policy reasons, it was felt that a seller
    should be responsible for injuries caused by defects in
    his products.
    
    959 F.2d at 435
     (citation omitted).
    Judge Greenberg reads our decision in Dillinger as
    precluding "inject[ion]" of "negligence principles in strict
    liability actions" only in those circumstances where the
    plaintiff's conduct "exacerbated or failed to prevent an
    injury caused by the defect." Dissent at 28. Judge
    Greenberg also states that the law of Pennsylvania does not
    preclude consideration of a plaintiff's conduct where that
    "conduct . . . caused an accident independently of the
    defect in the product." Dissent at 28. However, Judge
    Greenberg over simplifies the range of causes that typically
    lie behind an injury. In most cases (including those relied
    upon by Judge Greenberg) a reasonable fact finder could
    conclude that the injury resulted from a combination of
    plaintiff's conduct and the challenged defect. Judge
    Greenberg's analysis would seem to permit the use of
    plaintiff's conduct in these cases. However, I think that
    20
    neither our previous decision in Dillinger nor our decision
    today allows principles of contributory negligence to govern
    a dispute merely because "plaintiff's conduct set the events
    leading to the accident in motion" as Judge Greenberg
    believes. Dissent at 28.
    Judge Greenberg relies upon Bascelli v. Randy, Inc., 
    488 A.2d 1110
     (Pa. Super. Ct. 1985), and Gallagher v. Ing, 
    532 A.2d 1179
     (Pa. Super. Ct. 1987) and our discussion of them
    in Dillinger to support his conclusion that we have barred
    evidence of plaintiff's conduct only in situations where that
    conduct exacerbates an injury caused by the defect, or
    failed to prevent an injury caused by it, and not where the
    conduct causes an injury independent of the defect.
    Clearly, one can not be held liable in a strict liability action
    unless the claimed defect actually caused the injury. In
    other words, the defect must have been "a substantial
    factor in bringing about the harm." Powell v. Drumheller,
    
    653 A.2d 619
    , 622 (Pa. 1995), see dissent at 26. However,
    plaintiff's conduct is not relevant to this inquiry simply
    because such conduct may have also contributed to the
    injury. Before plaintiff's conduct can be admitted it must
    be viewed in context with the societal policies that lie
    behind strict liability and that assist in determining
    causation under Dillinger.
    In Bascelli, the Pennsylvania Superior Court did hold
    that evidence that the plaintiff had been driving a
    motorcycle 100 miles per hour was relevant to establish
    causation, and could not be excluded merely because it
    also intended to show contributory negligence. 488 A.2d at
    113. However, as we noted in Dillinger, Bascelli no longer
    provides us with guidance. In deciding Bascelli, the
    Pennsylvania Superior Court cited Greiner v.
    Volkswagenwerk Aktiengeselleschaft, 
    540 F.2d 85
     (3d Cir.
    1976) which, as we noted in Dillinger, was decided prior to
    Azzarello, supra, wherein the Pennsylvania Supreme Court
    "significantly broadened the scope of liability under § 402A."
    Dillinger, 
    959 F.2d at 442
    . In Dillinger we did state the
    following:
    Of more significance, the plaintiff's conduct in Bascelli
    actively contributed to the cause of the accident, while
    [plaintiff's] conduct in this case was merely insufficient
    21
    to prevent the accident attributable to the defect of the
    [product]. Thus, here the evidence was compelling that
    the defect which resulted in the hose damage, rather
    than [plaintiff's] conduct, triggered the accident.
    
    959 F.2d at 442
    .
    That statement, however, is best understood when viewed
    in context with the policy repercussions of ignoring conduct
    which, though foreseeable, is so unreasonable as to not
    justify finding the manufacturer liable even though the
    manufacturer is deemed to be the "guarantor" of its
    products.1 I submit that had Bascelli been exceeding the
    speed limit by only 5 miles an hour rather than rocketing
    through space at 100 miles per hour his conduct would not
    have been relevant to determining if the alleged defect (as
    opposed to his own behavior) was responsible for his loss of
    control. However, his conduct was so outrageous that it
    amounted to assumption of the risk, misuse of the product,
    and highly reckless conduct. In Dillinger we hypothesized
    that all three of those theories continue to be permissible
    defenses in a § 402A proceeding. 
    959 F.2d at 445-46
    . I
    believe that absent conduct which is so outrageous as to
    fall into one of those three categories the policy
    considerations that hold a manufacturer liable as a
    guarantor of its product control. However, once the
    plaintiff's conduct becomes so unreasonable and
    extraordinary as to amount to either assumption of the
    risk, misuse of the product, or highly reckless conduct, that
    conduct becomes relevant to causation as society has no
    interest in protecting such plaintiffs from the consequences
    of that kind of irresponsibility. Moreover, it is unjust to
    shift the cost of such injury from the person whose
    outrageous conduct caused it (or contributed to it) to the
    manufacturer who will in turn pass that cost on to
    innocent consumers.
    _________________________________________________________________
    1. As we noted in Dillinger:
    The [supplier] of a product is the guarantor of its safety. The
    product must, therefore, be provided with every element necessary
    to make it safe for [its intended] use, and without any condition that
    makes it unsafe for [its intended use].
    
    959 F.2d at 436
     (brackets in original).
    22
    This policy concern is written into the law of strict
    liability through the mechanism of causation. Accordingly,
    we observed in Dillinger:
    [t]he. . . issue of causation is raised when the
    plaintiff's action is so reckless that the plaintiff would
    have been injured despite the curing of any alleged
    defect, or is so extraordinary and unforeseeable as to
    constitute a superseding clause.
    
    959 F.2d at 446
     (internal quotations omitted) (internal
    citations omitted).
    In Pennsylvania, products liability law "shift[s] the loss to
    the party who can most easily bear it." Staymates v. ITT
    Holub Industries, 
    527 A.2d 140
    , 143 (Pa. Super. Ct. 1987).
    However, this general policy does not operate where it
    would cause an inappropriate or unjust result. Gallagher v.
    Ing, 
    532 A.2d 1179
     (Pa. Super. Ct. 1987) (cited by Judge
    Greenberg), is another example of this. There, the
    administratrix of the deceased driver of an automobile sued
    the manufacturer of the automobile alleging that a design
    defect had caused the decedent driver to lose control in a
    fatal car crash. The evidence that was produced at trial
    established that, at the time of the accident, the driver had
    a blood alcohol content of .18 percent. The jury was allowed
    to consider that evidence as it tended to establish that the
    decedent was "unfit to drive a vehicle safely," 532 A.2d at
    1181, and that the intoxication; not the alleged defect,
    caused the accident. The Pennsylvania Superior Court
    noted that such evidence was appropriate, not because it
    established intoxication per se, but because it established
    intoxication to the extent of rendering the decedent unfit to
    drive. The court noted that the defendant had produced
    evidence that the decedent had been drinking scotch for a
    period of approximately 1-1/2 hours before driving his car
    home and that some witnesses had observed that he had
    been "driving at a high rate of speed on a dark, winding
    and hilly road approximately one mile from the scene of the
    accident." Id. at 1182. The manufacturer had also produced
    expert testimony as to the ability of someone with a blood
    alcohol concentration of .18 percent to safely operate a car.
    On appeal the court noted that with a blood alcohol level
    that high,
    23
    virtually every person, adult or child. . . is markedly
    impaired with respect to . . . judgment, the response
    time, . . . the coordination. . . all of these things are
    progressively and markedly impaired. . . forensic
    toxicologists and everybody else says that this kind of
    a blood alcohol level, a person's likelihood of being
    involved in a fatal accident is over 20 times greater
    than that of a sober person. . . He can still drive.. .
    but not safely.
    
    532 A.2d 1182
    -3. Accordingly, the evidence was properly
    admitted to show that the decedent was "incapable of
    driving safely and that this was the legal cause of his loss
    of control of the vehicle he was driving." 
    Id. at 1183
    .
    Thus, Gallagher does not support Judge Greenberg's
    position to the extent that might at first appear although he
    correctly notes it as an example of a case where a plaintiff's
    conduct did set the events leading to the accident in
    motion. See dissent at 28. In theory, the conduct in
    Gallagher would have set the events leading to the accident
    in motion had the evidence shown marginal impairment or
    that the driver had exceeded the speed limit by 5 miles per
    hour. Yet, I do not believe that in those situations a jury
    could consider plaintiff's conduct on the issue of causation
    -- even if a manufacturer could show that had the plaintiff
    not been exceeding the speed limit, or not been slightly
    impaired, the particular defect would not have been
    sufficient by itself to cause loss of control. Few among us
    can honestly state that he or she has never exceeded a
    posted speed limit. That eventuality is most certainly
    foreseeable. Yet, that circumstance will not constitute an
    "intervening cause" and therefore justify consideration of
    plaintiff's conduct in a strict liability action unless that
    conduct rises to such a level as to constitute assumption of
    the risk, misuse of the product, or highly reckless conduct.
    See Dillinger, 
    supra.
     This is so even though plaintiff's
    conduct "set the events leading to the accident in motion."
    Thus, Judge Greenberg reads too much into the holding of
    Gallagher. Moreover, the discussion in Gallagher focused
    upon the reliability of the blood test, and the propriety of
    admitting evidence of intoxication in view of its propensity
    to generate bias. There is almost no discussion of the strict
    24
    liability and causation issue that we address here. The
    court's entire discussion of strict liability is at the very end
    of the opinion and is, in its entirety as follows:
    Appellant also argues that the trial court erred in,. . .
    (3) allowing appellee's counsel after ruling that
    comparative negligence principles had no application,
    to suggest to the jury that the defendant's negligence
    was the sole cause of the accident. We have examined
    these contentions carefully and conclude that they
    have been adequately analyzed and properly decided by
    the trial judge. Suffice it to say that appellant's
    contentions are lacking in merit and do not warrant a
    new trial.
    532 A.2d at 1185.
    In summary, I believe Judge Cowen correctly summarizes
    the state of Pennsylvania law under § 402A of the
    Restatement. Evidence of the decedent's actions in the
    instant case is appropriate only if a jury determined that
    such actions were "not reasonably foreseeable or were
    otherwise extraordinary." Majority Op. at 16, (emphasis
    added). I do not feel that Judge Greenberg's analysis allows
    for any meaningful distinction between circumstances
    where plaintiff's conduct becomes relevant to causation,
    and those where it is precluded by policy considerations
    that drive the doctrine of strict liability as enunciated by
    the Pennsylvania courts. If the alleged defect was "a
    substantial factor in bringing about the harm," absent
    assumption of risk, misuse of product, or highly reckless
    conduct, it is irrelevant whether plaintiff's conduct set the
    events in motion or merely failed to prevent an injury, and
    I do not read our decision in Dillinger to the contrary.
    25
    GREENBERG, Circuit Judge, dissenting.
    Judge Cowen has written a thoughtful opinion in a
    difficult field of law, but I am forced to dissent because I
    interpret aspects of Pennsylvania products liability law
    fundamentally differently. I first will explain my view of the
    law and then explain my differences with the majority and
    the consequences stemming therefrom.
    I agree with much of the majority's analysis of
    Pennsylvania law, including its discussion of the
    Pennsylvania Supreme Court's strong resistance to the
    inclusion of comparative fault principles in strict liability
    actions. I emphasize, however, that the Pennsylvania courts
    have been equally strong in maintaining the requirement
    that the plaintiff in a strict liability action bear the burden
    of showing both that the product was defective and that the
    defect proximately caused the injuries in question. See
    Berkebile v. Brantly Helicopter Corp., 
    337 A.2d 893
    , 898
    (Pa. 1975) ("Neither can plaintiff recover by proving a defect
    in the product absent proof of causation, as where plaintiff
    sustains eye injury while not wearing defective safety
    glasses."); Carrecter v. Colson Equip. Co., 
    499 A.2d 326
    , 329
    (Pa. Super. Ct. 1985) (plaintiff must show defect was a
    "substantial factor in bringing about" injuries suffered);
    Sherk v. Daisy-Hedden, 
    450 A.2d 615
    , 617 (Pa. 1982)
    ("Liability in ... strict liability is not imposed upon a
    manufacturer simply for the manufacture of a defective
    product.").
    Thus, evidence of the plaintiff's or a third party's
    conduct, whether negligent or not, is admissible to rebut
    the allegation that a defect actually caused the injury.
    Nevertheless, the Pennsylvania Supreme Court has held
    that a plaintiff's or third party's conduct does not relieve
    the defendant of liability for a defect which was a
    substantial factor in bringing about the accident unless the
    conduct constituted a superseding or intervening cause of
    the injury. Thus, the defendant is liable as long as the
    defect was "a substantial factor in bringing about the
    harm." Powell v. Drumheller, 
    653 A.2d 619
    , 622 (Pa. 1995),
    citing Jones v. Montefiore Hosp., 
    431 A.2d 920
    , 923 (Pa.
    1981). Of course, for a superseding cause to relieve a
    defendant whose conduct has been determined to be a
    26
    substantial factor in causing the harm, it must be "so
    extraordinary as not to have been reasonably foreseeable."
    Powell, 653 A.2d at 623; Kuisis v. Baldwin-Lima-Hamilton
    Corp., 
    319 A.2d 914
    , 920 (Pa. 1974). Accordingly, ordinary
    negligence will not do. The majority recognizes this point.
    See, e.g., Majority Op. at 7 ("[T]he plaintiff must show that:
    (1) a product defect (2) caused a harm (3) while the product
    was being used in a foreseeable manner."); Majority Op. at
    9 ("If foreseeable, the jury must find for the plaintiff unless
    it finds that the defect did not play even a substantial, or
    more than negligible, role in causing the plaintiff's injury.").
    Plainly, then, there is a distinction between a plaintiff's
    conduct which, rather than the defective product, was the
    cause of the injury and a plaintiff's conduct that was so
    extraordinary and unforeseeable that it was a superseding
    cause of the injury. Yet, if the injury is attributable to a
    plaintiff's conduct of either character, i.e., conduct that
    was the cause of the injury or unforeseeable superseding
    conduct, the defendant will not be liable even if its product
    was defective. An understanding of Pennsylvania product
    liability law requires that these concepts be kept separate
    so that a court understands the category into which the
    conduct fits when a defendant attempts to attribute the
    plaintiff's injury to his or her conduct.
    The Pennsylvania Supreme Court has not spoken
    explicitly on the issue of how evidence of plaintiff and third-
    party conduct should be treated at trial, but the
    Pennsylvania Superior Court has addressed the issue in a
    number of cases. In Bascelli v. Randy, Inc., 
    488 A.2d 1110
    (Pa. Super. Ct. 1985), the Superior Court held that evidence
    of the plaintiff's negligent conduct in driving his motorcycle
    approximately 100 miles per hour at the time of the
    accident was admissible to show that the excessive speed,
    and not the alleged defect in the product, caused the
    accident. 
    Id. at 1113
    . In Gallagher v. Ing, 
    532 A.2d 1179
    (Pa. Super. Ct. 1987), the court approved the admission of
    evidence of the decedent's blood alcohol level "to show that
    the decedent was so intoxicated that he was incapable of
    driving safely" and that the intoxication, rather than a
    product defect, caused the accident. 
    Id. at 1183
    . These
    cases illustrate the use of a plaintiff's conduct to
    27
    demonstrate that the injury cannot be attributed to a
    defective product.
    We considered how to treat a plaintiff's conduct in
    Dillinger v. Caterpillar, Inc., 
    959 F.2d 430
     (3d Cir. 1992). In
    Dillinger, we refused to allow evidence of the plaintiff's
    contributory negligence because the evidence could show
    only that he failed to prevent an accident resulting from a
    sequence of events set into motion by a defect in the
    product. 
    Id. at 442
    . Although in Dillinger we characterized
    the trend in the Pennsylvania Superior Court increasingly
    to inject negligence principles into strict liability actions as
    inconsistent with the rulings of the Pennsylvania Supreme
    Court, we drew a clear distinction between evidence of
    conduct which caused an accident independently of the
    defect in the product and evidence of conduct which
    exacerbated or failed to prevent an injury caused by the
    defect. We explicitly held only the latter type of evidence
    inadmissible. 
    Id. at 442
    , 444 n.23. Thus, we distinguished
    Bascelli and Gallagher as cases where the plaintiff's
    conduct set the events leading to the accident in motion. A
    number of district courts in this circuit have applied this
    approach. See, e.g., Ballarini v. Clark Equip. Co., 
    841 F. Supp. 662
    , 665 (E.D. Pa. 1993), aff'd, 
    96 F.3d 1431
     (3d
    Cir. 1996) (table); Kern v. Nissan Indust. Equip. Co., 
    801 F. Supp. 1438
    , 1441-43 (M.D. Pa. 1992), aff'd , 
    16 F.3d 404
    (3d Cir. 1993) (table).
    A reading of Dillinger which requires the exclusion of all
    evidence of foreseeable conduct by the plaintiff relating to
    causation would violate the clear requirement of the
    Pennsylvania Supreme Court that a plaintiff in a strict
    liability action must prove that the defect in the product
    caused the injuries. See Berkebile, 
    337 A.2d at 898
    . See
    also Kramer v. Raymond Corp., 
    840 F. Supp. 336
    , 338 (E.D.
    Pa. 1993) (holding that evidence of plaintiff's conduct is
    admissible to demonstrate that defect was not a cause of
    injury). After all, it hardly could be said that it is
    unforeseeable that a motorcycle driver will go at a high
    speed. Nevertheless, in Bascelli evidence of that speed was
    admissible to show that speed, rather than a product
    defect, caused the accident. Thus, Bascelli was not a
    superseding cause case.
    28
    It seems to me that the majority erroneously reads
    Dillinger to require the exclusion of all evidence of
    foreseeable conduct of a plaintiff relating to causation, for
    it indicates that the jury instruction was "fatally erroneous
    [because] it failed to require the jury to analyze whether Mr.
    Parks' actions were unforeseeable or extraordinary."
    Majority Op. at 18. The majority then indicates, erroneously
    in my view, that "[i]f the jury found that the actions were
    neither unforeseeable nor extraordinary, it could not have
    found his actions to be a ``legal cause' of his injury." 
    Id.
     The
    result the majority reaches does not take into account the
    distinction in Pennsylvania law between treatment of a
    plaintiff's negligence which is the sole cause of the injury
    and a plaintiff's negligence which combines with a defect in
    the product to cause the injury. Negligence of the second
    kind could defeat the claim only if so extraordinary as to be
    unforeseeable.
    I now consider the jury charge. The district court
    instructed the jury that there were four possible causes of
    the accident, the alleged defect in the product, Parks'
    conduct, his employer's conduct, and his co-worker's
    conduct, all of which could be legal causes of the accident.
    App. at 416-17. The court further instructed the jury that
    if it found a defect and that "the defect was a substantial
    factor in causing the harm, then your verdict will be for the
    plaintiff even if you find ... [that any other conduct] were
    legal causes of the accident because I already told you there
    may be more than one legal cause. . . . So, in order to find
    for the defendants, you must find that the alleged defect
    was not the legal cause of the accident." 
    Id. at 417-19
    .
    I regard this charge as consistent with Pennsylvania law.
    The charge recognized that if a combination of a defect in
    the product and Parks' or another person's negligence
    caused the accident, the plaintiff would win. The majority
    makes much of the fact that the court used the phrase "the
    legal cause" rather than "a legal cause." Majority Op. at 17-
    18. While I agree that "a" is the proper article to use in this
    situation, I do not agree that this error so taints the charge
    as a whole that it could have misled the jury. The judge
    told the jury to consider the conduct only as it relates to
    the initial causation of the accident to evaluate which
    29
    events were substantial factors in bringing about the
    accident. Furthermore, the interrogatory to which the jury
    answered "No," thereby returning a verdict for the
    defendant, read as follows: "Was the defect in the excavator
    a substantial factor in bringing about Mr. Parks' death?"
    The jury of course, had the interrogatory when it
    deliberated and in these circumstances I cannot believe
    that the use of "the" rather than "a" in the charge mattered.
    In my view, the majority's holding that a foreseeability
    charge was required is fundamentally wrong because the
    plaintiff and third-party conduct was not presented to the
    jury as a superseding cause of the accident. Rather, the
    defense advanced that conduct as the sole cause of the
    accident. In a superseding cause situation, the defect is still
    a "but for" cause of the accident, or a substantial factor,
    but the superseding cause of the accident may excuse the
    defendant from liability if not reasonably foreseeable. Here,
    the court charged the jury to consider whether the alleged
    defect was a "substantial factor" in causing the accident
    and the jury found that it was not. It seems to me to be
    clear that when a court lays the precepts of Pennsylvania
    law against the charge, it should conclude that the charge
    did not include a reversible error.
    The main difference between my view and the majority's
    view, besides the result we reach, is the majority's holding
    that "the threshold question is whether the plaintiff's
    actions were foreseeable." Majority Op. at 9. I do not
    understand how it can make this statement, because it
    confuses substantial factor causation, i.e., the
    responsibility of the defendant in the first instance, with
    superseding causation. A superseding cause, if not
    reasonably foreseeable, breaks the chain of causation, but
    the jury must first find that there was a chain. The
    majority's holding eliminates this requirement and the
    majority says that "[c]ausation may be shown by process of
    elimination. . . ." Majority Op. at 10. The majority does not
    have case law to support this conclusion. The cases it cites
    deal with accidents where superseding causes exist after
    the defect first is found to be a substantial factor, e.g.,
    Decorative Precast Stone Erectors, Inc. v. Buckrus-Erie Co.,
    
    493 F. Supp. 555
    , 557 (W.D. Pa. 1980), aff'd , 
    642 F.2d 441
    30
    (3d Cir. 1981) (table), where the plaintiff allegedly recklessly
    exposed himself to a defect, Childers v. Power Line Equip.
    Rentals, Inc., 
    681 A.2d 208
    -09 (Pa. 1996), where
    substantial change or misuse of a product is charged, Eck
    v. Powermatic Houdaille, 
    527 A.2d 1012
    , 1019 (Pa. 1987),
    or where the existence of a defect rather than causation is
    at issue, see Schell v. AMF, Inc., 
    567 F.2d 1259
    , 1262 (3d
    Cir. 1977).
    We face none of those situations in this case. The issue
    at trial here was whether the defect in the product was a
    substantial factor in causing the accident. The jury
    instructions correctly said that if it was the plaintiff must
    win. The jury found for the defendant by answering an
    interrogatory expressly finding that the defect was not a
    substantial factor in bringing about the accident. The
    majority will not allow a verdict based on the jury's answer
    to this interrogatory to stand because it holds that a
    foreseeable action by the plaintiff cannot be a "legal cause"
    of an accident. Majority Op. at 17-18. "Instead, it is
    removed from the picture, and liability attaches to the
    remaining causal actor or actors." Majority Op. at 12. I
    believe that this approach is simply wrong for it eliminates
    the jury's role in determining whether a defect is a
    substantial factor in an accident. It turns all cases
    involving causation into superseding cause cases in the
    sense that unless the plaintiff's or third party's conduct is
    not foreseeable, it cannot be the legal cause of the accident.
    As Bascelli, the 100 miles per hour motorcycle case, so
    clearly demonstrates, this is wrong. The majority opinion
    overlooks the fact that the jury first must find a chain of
    causation before considering whether a superseding cause
    breaks the chain. It assumes that a chain exists.
    Under the majority's view, a defendant could be found
    liable for a defect even if the defect did not contribute to the
    happening of the accident, because the majority removes
    from the case the possibility that foreseeable conduct of the
    plaintiff or a third party was the cause of the accident. It is
    important to remember that just because an accident is a
    type which a defect might cause does not mean that the
    defect necessarily did cause the accident. It is up to the
    jury to make this determination, not the court. Thus, I do
    31
    not believe the Pennsylvania Supreme Court would condone
    the result reached here. The majority's opinion will force
    the district court to try the case on the remand on incorrect
    principles of law and will require it to deliver an incorrect
    charge.
    In responding to my dissent in which I emphasize that
    the majority does not take into account the distinction
    between a plaintiff's negligence which is the sole cause of
    the injury and a plaintiff's conduct that was an
    unforseeable superseding intervening cause of the injury,
    the majority sets forth the following:
    The instant case is precisely of the second type: the
    jury explicitly answered yes to the question, ``Was the
    Gradall excavator defective at the time it was
    manufactured and sold?' App. at 432. The machine's
    defect was impaired visibility of precisely the area in
    which the accident occurred. In accordance with the
    dissent's above description, the manufacturer of the
    defective product should be held liable unless the
    plaintiff's actions were unforseeable.
    Majority Op. at 9-10 n.3.
    I deduce from the foregoing analysis that the majority,
    sitting as a court of appeals, must be determining as a
    matter of law that the nature of the defect meant it had to
    be a substantial factor in bringing about the accident. I
    cannot understand how the majority can make this
    determination because it is deciding the proximate cause
    issue and deciding it contrary to the jury which expressly
    answered "no" to the following question: "Was the defect in
    the excavator a substantial factor in bringing about Mr.
    Parks' death?" The fact that the machine had impaired
    visibility no doubt led the jury to find that it was defective.
    Yet that finding simply did not determine that the defect
    was a substantial factor in bringing about the accident.
    Thus, just as I have indicated already, the majority turns
    all cases involving causation when a plaintiff's or third
    party's conduct is involved into superseding cause cases so
    that unless the plaintiff's or third party's conduct is
    unforeseeable, it cannot be the legal cause of the accident.
    32
    As far as I am concerned this appeal is being decided
    incorrectly which in itself is unfortunate. But the
    consequences of the majority opinion go beyond this case.
    There are many diversity of citizenship products liability
    cases under Pennsylvania law tried in this circuit. From the
    time of the publication of the opinion in this case the
    district courts will be confronted with following
    Pennsylvania law, as announced by the Pennsylvania
    courts and permit the jury to conclude that a plaintiff's or
    third party's conduct, even if foreseeable, can be the sole
    proximate cause of an injury, or following the majority's
    opinion which makes clear that the injury can be attributed
    to plaintiff's or third party's conduct only if that conduct is
    not foreseeable. I presume that the district courts will
    follow the majority's opinion here and thus the outcome of
    a case may be determined on whether it is tried in the state
    or federal court. This is serious business.
    Judge McKee's concurrence misinterprets the holding I
    suggest would be appropriate here and thus it does not
    persuade me that my views are wrong. I do not believe, as
    Judge McKee suggests I do, Concurrence at 20-21, that a
    plaintiff's conduct can be used to relieve a defendant of
    liability merely because it contributed to an accident
    caused by a defect. In fact, I believe the opposite to be true.
    Yet, a jury must determine whether the defect is actually a
    substantial factor in causing the accident and thus must
    consider what else, including a plaintiff's conduct, could
    have caused the accident without contribution from the
    defect. Thus, I agree with Judge McKee when he states:
    " ``[i]f the alleged defect was a substantial factor in bringing
    about the harm,' absent assumption of risk, misuse of
    product, or highly reckless conduct, it is irrelevant whether
    plaintiff's conduct set the events in motion or merely failed
    to prevent an injury . . . ." Concurrence at 25.
    Unfortunately, however, the result being reached here will
    not allow the jury to decide whether the defect is "a
    substantial factor in bringing about the harm."
    Indeed, Judge McKee's explanation of Judge Cowen's
    opinion effectively admits this point because, quoting Judge
    Cowen, he indicates that "[e]vidence of the decedent's
    actions in the instant case is appropriate only if a jury
    33
    determined that such actions were ``not reasonably
    foreseeable or were otherwise extraordinary.' " Concurrence
    at 25. This statement simply cannot be correct because it
    removes from the jury the opportunity to consider whether
    the defect was "a substantial factor in bringing about the
    harm." A plaintiff's unexceptionable conduct may cause a
    plaintiff using a defective product to be injured without the
    defect in the product contributing to the injury. For
    example, a car might be delivered with defective brakes but
    if a plaintiff driving the car who is about to get into an
    accident, whether or not he is negligent, does not use the
    brakes, then the defect simply is not a substantial factor in
    bringing about the harm even if the brakes would not have
    worked if the plaintiff had applied them. In such a case the
    defendant should be able to establish that the defective
    brakes had nothing to do with the accident and the
    defendant should win in a products liability case. See
    Berkebile, 
    337 A.2d at 901
     ("Whether decident actually
    attempted autorotation is relevant to the issue of causation.
    If the jury were to conclude, for example, that a non-
    defective system would allow two seconds for autorotation
    and that the decedent did not attempt autorotation for
    three seconds; even if a defect was shown, it would not
    have been the proximate cause of the crush.").
    The fact in my brakes example that the plaintiff might
    have been negligent is immaterial and thus if the plaintiff
    was negligent his negligence would not bar his claim.
    Rather, he would lose because the defect was not a
    substantial factor in bringing about the accident. The
    district court properly tried the case applying these
    principles which Pennsylvania law (and probably the law
    through the United States) establishes, and thus we should
    affirm.
    In the circumstances I am constrained to dissent.
    A True Copy:
    Teste:
    Clerk of the United States Court of Appeals
    for the Third Circuit
    34