OPINION
Defendant-appellant General Dynamics Armament and Technical Products, Inc. (“General Dynamics”), seeks to appeal from the district court’s denial of its summary judgment motion in an action arising from the premature explosion of a mortar cartridge manufactured by General Dynamics during an army training exercise in Hawaii.
1
The explosion killed Oscar Rodriguez and injured Samuel Oyola-Perez, Julius Riggins, and Wilfredo Dayandante (collectively, “Plaintiffs”), the other soldiers in the training detail, who brought suit against General Dynamics alleging,
inter alia,
products liability and negligence claims under Hawaii law. General Dynamics moved for summary judgment on the merits of the Plaintiffs’ claims and also on the ground that the government contractor defense, first articulated in
Boyle v. United Technologies Corp.,
I.
A.
During a live-fire U.S. Army training exercise in Hawaii on March 10, 2006, an 81mm M374A3 HE (High Explosive) mortar cartridge exploded prematurely in the barrel of a mortar. Shrapnel from the explosion killed Staff Sergeant Rodriguez and caused serious injuries to Oyola-Perez, Riggins, and Dayandante.
Following the explosion, the Army conducted an investigation, which identified several possible causes of the explosion including material defects in the cartridge and a “double loading” scenario in which a cartridge was already in the tube when another cartridge was loaded. The Army’s report concluded that “the evidence and test data cannot identify the exact cause of the malfunction incident.”
B.
The Plaintiffs brought suit against General Dynamics as the successor to Martin Marietta alleging, inter alia, strict products liability and negligence claims under Hawaii state law. The complaint alleged that the explosion was caused by a manufacturing defect in the mortar cartridge and that the cartridge did not comply with the design and specifications issued by the government. General Dynamics’s theory of the case was that human error, specifi *1263 cally double-loading of the mortar cartridges, caused the explosion.
General Dynamics moved to exclude the Plaintiffs’ expert’s opinions and also filed two motions for summary judgment. The first motion sought summary judgment on the merits of Plaintiffs’ strict liability negligence claims. The second motion rested on, inter alia, the government contractor defense.
In its order addressing all of General Dynamics’s motions, the district court first denied General Dynamics’s motion to exclude the Plaintiffs’ expert’s opinions. The Plaintiffs’ expert stated opinions about the cause of the mortar explosion and the court found that he was qualified to do so and that his opinions would be helpful to the trier of fact within the meaning of Rule 702 of the Federal Rules of Evidence. In particular, the court found that the expert’s opinion that the premature explosion was caused by a defect in the cartridge body, voiding or cracking in the high explosive filling, or a foreign body in the high explosive filling, was reliable and based on techniques generally accepted in the relevant expert community.
In support of its summary judgment motions, General Dynamics introduced the Army’s specification documents for the cartridges, as well as affidavits attesting to Martin Marietta’s compliance with the Army’s requirements, to demonstrate that it had complied with the government’s specifications.
After reviewing the inconclusive results of the Army’s investigation, the district court noted that the Plaintiffs’ expert opined, to a reasonable degree of scientific certainty, that “the explosion was caused by a defect in the cartridge body ..., excessive voiding or cracking of the high explosive filling, or a foreign body in the high explosive filling.” On the other hand, one of General Dynamics’s experts opined, also to a reasonable degree of scientific certainty, that the explosion was caused by human error in double-loading cartridges in the mortar. General Dynamics’ other expert testified that, absent human error, if a mortar cartridge were manufactured according to the government’s specifications it would not explode inside the mortar. The court also noted that OyolaPerez, who was injured during the explosion, asserted that double loading was not the cause of the explosion; and that, as part of its investigation, the Army conducted double-load tests and none of the mortars exploded in the barrel.
Addressing the negligence and strict liability claims on the merits, and viewing the evidence in the light most favorable to Plaintiffs, the district court held that there were disputed issues of fact sufficient to defeat General Dynamics’ motions for summary judgment. The district court ruled that there were triable issues of fact as to whether the cause of the explosion was double-loading, or a defect in the cartridge at the manufacturing stage, or some other cause (e.g., defects in the fabricated parts that third-party companies manufactured and that Martin Marietta then assembled as part of the manufacturing process). The court further noted that there was a question of fact as to whether Martin Marietta manufactured the cartridge according to the government’s specifications.
General Dynamics filed a timely notice of appeal, challenging only the portion of the district court’s order denying the government contractor defense. It also filed a “Motion to Confirm a Stay of all Proceedings,” which the district court denied, commenting that General Dynamics was “clearly attempting to appeal a nonappealable order.”
*1264 II.
A.
We first determine whether we have jurisdiction over this interlocutory appeal. Under 28 U.S.C. § 1291, our jurisdiction is limited to appeals from final judgments. A denial of a summary judgment motion is generally not reviewable because it is not a final judgment.
See, e.g., Brodheim v. Cry,
However, a denial of summary judgment may be appealable under the collateral order doctrine. “[A] decision of a district court is appealable if it falls within ‘that small class which finally determine[s] claims of right separable from, and collateral to, rights asserted in the action, too important to be denied review and too independent of the cause itself to require that appellate consideration be deferred until the whole case is adjudicated.’ ”
Mitchell v. Forsyth,
A denial of a claim of immunity may be an immediately appealable order within
Cohen’s
“narrow exception.”
Del Campo v. Kennedy,
The rationale for allowing an interlocutory appeal when a court denies a motion for summary judgment grounded on immunity is that the claimed right to immunity includes the right not to proceed to trial; this right would be lost if not immediately reviewable.
Mitchell v. Forsyth,
The availability of an interlocutory appeal from a denial of qualified immunity is also “limited to the purely legal question of immunity.”
Rodriguez v. Maricopa Cnty. Cmty. Coll. Dist.,
In addition, the Supreme Court has stressed that, in applying the collateral order doctrine, “it must ‘never be allowed to swallow the general rule that a party is entitled to a single appeal, to be deferred
*1265
until final judgment has been entered.’ ”
Mohawk, Indus., Inc. v. Carpenter,
— U.S.-,
B.
General Dynamics frames the district court’s order as a denial of its government contractor defense, and therefore as a denial of immunity from suit, rather than as a denial of summary judgment based on a disputed issue of material fact. Framed this way, General Dynamics contends that it has established each of the elements of the government contractor defense and, therefore, the district court erred by denying it immunity. It also asserts that it has satisfied each of the three elements allowing for an interlocutory appeal under the collateral order doctrine. Because we hold that the government contractor defense is not a grant of immunity and that the district court denied summary judgment on the basis of a disputed issue of material fact, we dismiss this appeal.
In general, the government contractor defense shields contractors from tort liability in state or federal actions where plaintiffs allege they sustained injuries as a result of exposure to defective products or equipment manufactured or supplied under a government contract. In
Boyle,
the Supreme Court stated that the government contractor defense involved “uniquely federal interests” that could preempt and bar the plaintiffs’ state law design-defect claim where the facts supported each of the three elements of the defense.
Liability for design defects in military equipment cannot be imposed, pursuant to state law, when (1) the United States approved reasonably precise specifications; (2) the equipment conformed to those specifications; and (3) the supplier warned the United States about the dangers in the use of the equipment that were known to the supplier but not to the United States.
Id.
at 512,
Although the source of the government contractor defense is the United States’ sovereign immunity, we have explicitly stated that “the government contractor defense does not confer sovereign immunity on contractors.”
United States ex rel. Ali v. Daniel, Mann, Johnson & Mendenhall,
Our decision in
Phillips v. E.I. DuPont de Nemours & Co. (In re Hanford Nuclear Reservation Litigation),
The government contractor defense applies only when a contractor meets its burden of establishing three facts: (1) the United States set forth “reasonably precise specifications”; (2) “the equipment conformed to those specifications”; and (3) the supplier provided the United States with adequate warnings of the dangers.
Boyle,
There is evidence from which the fact-finder could conclude that General Dynamics complied with the government’s specifications, in which case General Dynamics will be entitled to the government contractor defense. However, contrary evidence also appears in the record and, until the requisite facts are determined, General Dynamics is not entitled to the government contractor defense.
Once the relationship of the government contractor defense to the underlying claims is understood, it is clear that the district court’s order does not qualify for an interlocutory appeal under the collateral order doctrine. The denial of the government contractor defense at the summary judgment stage does not conclusively determine General Dynamics’ liability or even determine whether it is entitled to the government contractor defense. Also, the ruling does not resolve any “important issue completely separate from the merits of the action.”
Coopers & Lybrand,
Even if we were to treat the government contractor defense as a claim of qualified immunity, we could not grant General Dynamics relief. “Our jurisdiction to review an interlocutory appeal of a denial of qualified immunity ... is limited exclusively to questions of law.”
Wilkinson v. Torres,
III.
We also decline General Dynamics’ request that its notice of appeal be
*1267
treated as a petition for writ of mandamus to resolve the
Boyle
defense on the merits. “The writ of mandamus is an ‘extraordinary1 remedy limited to ‘extraordinary’ causes.”
Burlington N. & Santa Fe Ry. Co. v. U.S. Dist. Court (Cebull),
The court will issue the writ only under very limited circumstances:
[W]e review the district court’s orders, not for an abuse of discretion, but for clear error. Under this standard, we will only issue the writ for usurpation of judicial power or a clear abuse of discretion. Five “objective principles” guide the inquiry: whether (1) [the appealing party] has no other adequate means, such as direct appeal, to attain the relief, (2) he will be damaged or prejudiced in a way not correctable on appeal, (3) the district court’s order is clearly erroneous as a matter of law, (4) the district court’s order is an oft-repeated error, or manifests a persistent disregard of the federal rules, or (5) the district court’s order raises new and important problems, or issues of law of first impression.
Cordoza v. Pac. States Steel Corp.,
Here no extraordinary circumstances justify issuance of a writ. As we have noted, the government contractor defense does not confer an immunity from suit, the district court’s finding of a genuine issue of material fact is not clearly erroneous, and General Dynamics has not shown that it will be damaged in a manner not correctable on appeal. Rather, General Dynamics retains the right to raise the government contractor defense both at trial and on appeal from a final order of the district court.
See Cordoza,
IY.
We dismiss this appeal for lack of jurisdiction. Consistent with our prior decisions, we hold that the government contractor defense does not confer absolute or qualified immunity. Accordingly, the denial of a motion for summary judgment based on the government contractor defense is not usually appealable under the collateral order doctrine. Certainly, the district court’s order in issue here, grounded on genuine issues of material fact, is not immediately appealable. General Dynamics has also failed to make the type of extraordinary showing required for us to treat its appeal as a petition for an extraordinary writ of mandamus. The appeal is
DISMISSED.
Notes
. The parties stipulated that General Dynamics manufactured the mortar cartridge, although it was actually manufactured by General Dynamics’s predecessor-in-interest, Martin Marietta Aluminum Sales, Inc. ("Martin Marietta”).
