Utility transport version for the US Army. The aircraft was re-designated to CH-37A in 1962 as part of the overall rationalization of designations for US Armed Forces aircraft.
The aircraft included a manually folded main rotor and hydraulically folded tail rotor pylon.
Source: S-56/HR2S-1/H-37 Helicopter, Vinny Devine, Igor I. Sikorsky Archives, April 2013)
Design authority: Sikorsky Aircraft Division, United Aircraft and Transport Corporation
Primary manufacturer: Sikorsky Aircraft Division, United Aircraft and Transport Corporation
Parent type: Sikorsky S-56/H-37
Aircraft status: No longer flying
VTOL type: Helicopter
Lift devices: 1 Single main rotor
Dedicated control device: 1 Tail rotor
Crew required: 2 in Side-by-side arrangement
Landing gear: Wheels (all retractable)