U.S. resumes F-35 ground tests after device failure

The U.S. Defense Department said on Wednesday it had authorized a resumption of ground test operations of Lockheed Martin Corp's LMT.N F-35 Joint Strike Fighter aircraft, its costliest arms program.

The department had suspended ground and flight test operations on Aug. 3 after the failure of one aircraft's "integrated power package" — a turbo-machine that starts the engine and cools the plane.

"This is the first step in returning the F-35 fleet to full flight operations," a Pentagon spokesman said.

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