| Description |
 Purpose: facilitation of internal and external communication as well as supplying the crew with emergency warnings and messages through telecoded commands.Functions:
- Internal communication between three pilots;
- External communication through four radio stations;
- Priority assignment for radio communication control between the pilots;
- Monitoring of three RNSs with RNS adjustment and disconnection features;
- Monitoring of five caution signals;
- Separate volume control of internal and external communication;
- crew voice-band channel redundancy at failures;
- interfacing with control panels via serial and parallel channels;
- interfacing with registration and control equipment;
- Playback of up to 256 emergency warnings with transmitting necessary data by radio;
- flight number setting/ volume control, flight information logbook playback.
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Specification
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