U.S. Air Force safety investigators have approved the return to flight of the F-35 flight-test force while continuing to explore what caused the failure of an integrated power package (IPP) and subsequent fire on AF-4. The fire was quickly extinguished by onboard systems after the Aug. 2 incident at Edwards AFB, Calif. The investigators have narrowed down the root cause to an IPP valve that “did not function properly,” according to a statement issued today by the U.S.-led F-35 Joint ...


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