Luke AFB ends altitude limit after F-35s oxygen concerns

Posted: Updated:
Luke Air Force Base officials say they have ended altitude restrictions on their F-35 fighter jets put in place after several pilots reported symptoms of oxygen deprivation. (Source: 3TV/CBS 5) Luke Air Force Base officials say they have ended altitude restrictions on their F-35 fighter jets put in place after several pilots reported symptoms of oxygen deprivation. (Source: 3TV/CBS 5)
GLENDALE, AZ (AP) -

Luke Air Force Base officials say they have ended altitude restrictions on their F-35 fighter jets put in place after several pilots reported symptoms of oxygen deprivation.

[RELATED: Luke Air Force Base grounds all F-35 flights]

The 25,000-foot (7,600-meter) limit implemented on June 20 came after an 11-day grounding of the new stealth fighters at the training base west of Phoenix. Five pilots reported symptoms between May 2 and June 8.

[MORE: Uncertain F-35 future worries some west Valley businesses] 

Brig. Gen. Brook Leonard says in a Wednesday statement that the Air Force hasn't found a cause for the Luke pilots' symptoms. But it has boosted training and worked to reduce potential causes for labored breathing or carbon monoxide ingestion. Leonard commands the base's 56th Fighter Wing.

[RELATED: F-35 War Birds: Worth the cost?]

The military has had a series of problems with various aircraft in recent years involving pilots suffering from lack of oxygen.

Click/tap here to download the free azfamily mobile app.

Copyright 2017 KPHO/KTVK (KPHO Broadcasting Corporation). All rights reserved.