The Air Force grounded T-6A Texan II flying operations Nov. 15 after pilots reported oxygen problems — the fourth incident since Nov. 1.
According to officials of the 71st Flying Training Wing at Vance Air Force Base, Oklahoma, four instructor pilots and one student pilot reported physiological incidents while flying.
“Vance Air Force Base is committed to ensuring aircrew safety is paramount, and are conducting a full investigation of the reported cases,†said Col. Darrell Judy, 71st FTW commander.
According to the Air Force, the aircraft’s backup oxygen system operated as designed, and pilots followed the correct procedures, landing aircraft safely.
http://www.foxnews.com/us/2017/11/29/air-force-grounds-training-planes-citing-oxygen-problems.html
