The C6533/ARC Communications System Control unit (or “Intercom”) is a communication device that provides audio monitoring and voice transmission selection capabilities to multiple radio channels, as well as internal communications between pilot and crew on rotary wing aircraft.
The Communications System Control unit is in use by five types of US Army rotary wing aircraft and their variations; AH-1, CH-47D, OH-58A/C, UH-1H/1V, and UH-60A/L. Under a U.S. Army contract, ACI Technologies Successfully redesigned and tested a replacement for the C6533A/ARC, which is compatible to its predecessor.
ACI Technologies is the only current approved source for the C6533A communication system.