F-35s grounded at Arizona base after pilots report oxygen problems

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The Air Force has “temporarily” grounded a squadron of F-35s at Luke Air Force Base in Arizona because five pilots in the past five weeks have reported symptoms consistent with oxygen deprivation, known as “hypoxia,” the service announced on Friday.

In all five cases, the F-35’s back-up oxygen system was engaged and the single-seat planes landed safely.

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