A version of this article appears in the September 8 issue of Aviation Week & Space Technology. The long-delayed operational debut for the Lockheed Martin F-35 Joint Strike Fighter is at risk of further slippage due to a safety-critical problem with its Pratt & Whitney F135 engine for which no single root cause has yet been identified. Senior leaders initially dismissed the fire that damaged F-35 AF-27 at Eglin AFB, Florida, on June 23 as a “one-off incident,” as U.S. ...

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