MIL-M-85831, MILITARY SPECIFICATION: ASK, HELICOPTER AIRCREWMAN, CHEMICAL, BIOLOGICAL, RADIOLOGICAL PROTECTIVE, NON-OXYGEN (06-NOV-1989)

MIL-M-85831, MILITARY SPECIFICATION: ASK, HELICOPTER AIRCREWMAN, CHEMICAL, BIOLOGICAL, RADIOLOGICAL PROTECTIVE, NON-OXYGEN (06-NOV-1989)., This specification establishes the requirements for the manufacture and acceptance of a mask to be used with and form part of the Protective Assembly. Helicopter Aircrewman, Chemical, Biological, Radiological (PASS).