US Army, Technical Manual, TM 55-1680-317-CL-6, CHECKLIST FOR OV-1 AIRCRAFT, COLD CLIMATE SURVIVAL KIT (RSSK), 11-1-1960, (NSN 1680-00-148-9233), 1981
Scope. The inspections prescribed by this manual will be
accomplished at specified periods by organizational
maintenance activities with assistance of direct and general
support activities when required.