The US Air Force has stopped flying all Lockheed Martin F-22s for an indefinite period over concerns about a possible glitch in the onboard oxygen generation system.The stand-down order issued on 3 May by Air Combat Command ACC chief Gen Will Fraser comes about six weeks after the F-22s were restricted to flying below 25,000ft due to the same problem.The order is in effect until “further notice”, the ACC says.

via Oxygen system concerns prompt F-22 stand-down.