1. Equipment is designed to establish two-way telephone intercommunication between crew members and to go on the air for a radio contact, listening the signal of radio navigation equipment and special purpose for public address as well as for communication between crews and maintenance personnel at engine starting.

Microwave radiostation BAKLAN-20 is designed to establish fixed-wave telephone radiocommunication of aircraft crew with ground dispatcher ATS services and crews of other aircraft in frequency range from 118 to 137.975 Mhz with frequency spacing between standby channels 25 kHz. Two radiostations BAKLAN-20 are installed on aircraft.

DKMV radiostation ARLEKIN-DE is designed to establish fixed-wave, two-way telephone radio communication of aircraft crew with ground dispatcher ATS services and crews of other aircraft in frequency range from 200 to 299999 Mhz with descreteness 100 Hz.

One set of radiostation, which operates on magneto waterslotted antenna, is installed on aircraft.

Emergency MW-DMW - radistation P-855A1 is designed for communication the crew, being out of aircraft and performing the forced landing out of aerodrome, with aircraft of search and rescue service and to direct them to place of radiostation being.

Radiostation is portable, small size, individual using and provides two-way, fixed-waved radio communication on two fixed frequencies as well as it may be used as radio beacon with intermittent modulation.

Emergency HF radiostation P-861 is designed to communicate the crew being out of aircraft and performing the forced landing out of aerodrome with bases and aircraft of search and rescue services. Radiostation provides two-way fixed-wave communication with HF radiostations in telephone and telegraph modes as well as it may be used in mode of automatic transmission of distress signals.

Emergency radio buoy KOSPAS ARB-PK10. Buoy is a radiotransmitter of distress signal and it is designed to use in international satellite system of search and rescue of emergency objects KOPAS-SARSAT.

Emergency radiobeacon ELT-96 - is a radiotransmitter of distress signals and designed to use in international satellite system of search and rescue of emergency objects KOSPAS-SARSAT.

Airborne voice register OPAL-B - is designed for continuous recording of all voice information of aircraft on magnetic tape, using five independent channels. Airborne voice register provides recovery of recorded data for the last 2 hours of flight.