AVSA-85-E apparatus

Aircrew internal communication equipment (AVSA-E) is designed to enable the flight crew: 1) internal two-way telephone communication with other flight crew members and members of ground support personnel; circular communication with other flight crew members; negotiation with the chief flight attendant.
2) access to external radio communication by connecting to one of five radio stations; selective listening to all receivers of radio stations
3) simultaneous listening to special purpose signals (SPS);
4) interfacing with the equipment of magnetic recording of negotiations.