tions: manual for Army Model Helicopter, Observation, OH-58A includes the Maintenance Manual: Electronic Equipment Configuration Army Model OH-58A A sample of the manuals contained:TM55-2840-256-23 Aviation unit and aviation intermediate maintenance for engine, aircraft, turbo shaft (nsn Aviation Unit and Intermediate Maintenance Manual: Army Model OH-58A and OH-58C Helicopters, Volumes 7-992. Front Cover. Headquarters, Department of the Bibliographic information ; Title, Aviation Unit and Intermediate Maintenance Manual: Army Model OH-58A and OH-58C Helicopters Aviation Unit and Intermediate Maintenance Test Flight Manual: Army Model OH-58C Helicopter. Front Cover. Headquarters, Department of the Army, 1982 - Helicopters. This item is: Bell Kiowa OH-58A Maintenance Test Flight Manual.Aviation Unit and Intermediate Maintenance Manual for Army Model OH-58A and OH-58C Helicopters. TM-55-1520-228-23-1Download. OH-58A main maintenance manual.