Burn-In,’ ‘Pre-Trenching’ Fixes Approved For F-35 Test Jet Engines

Within the next three months, all 19 F-35 test jets will incorporate a fix to avoid a recurrence of the excessive friction in the third-stage integrally bladed rotor (IBR) that prompted a June fire in a Pratt & Whitney F135 engine in June, says U.S. Air Force Lt. Gen. Christopher Bogdan, F-35...

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