MIL-C-85521, MILITARY SPECIFICATION: CONCENTRATOR, OXYGEN, GGU-7/A (05-AUG-1983)

MIL-C-85521, MILITARY SPECIFICATION: CONCENTRATOR, OXYGEN, GGU-7/A (05-AUG-1983)., This specification covers the requirements for one type of oxygen concentrator which, as part of an on-board oxygen generation system (OBOGS), separates oxygen from air and provides it as a breathing gas to the aircrew member.