The U.S. Air Force has grounded its T-6A Texan II trainers

The U.S. Air Force has grounded its T-6A Texan II trainers until all oil coolers can be replaced on the Pratt&Whitney PT6A-68 turboprop engine. Flight operations were already suspended for unrelated reasons because of a crash Aug. 31. The oil cooler manufacturing flaw was first discovered by a...

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