Latest "F-35-Joint-Strike-Fighter" stories
This will be the F-35's third delivery halt in less than a year, and dozens of newly-constructed aircraft could be affected.
GAO said some defense officials believe the true amount of lost spare parts may be even higher.
Pratt & Whitney says all new F135 engines it is now delivering come with the vibration fix already installed.
The affected F-35s could be back in the air in one to two weeks.
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