SO-72M

Information transmitted by SO-72M

Depending on aircraft configuration and selected mode, the transponder can provide aircraft identity, altitude-related information and other coded data to the ground system. The Tu-214 technical description identifies SO-72M operation with domestic and international secondary radar channels and states power consumption limits of 100 W from the 27 V DC network and 60 VA from the 115 V, 400 Hz network. The installed set may include the main unit, information-conversion equipment, control panel and antenna system.

System integration and operation

SO-72M belongs to the aircraft radio and surveillance equipment rather than the power-control units that share this catalogue category. Correct replies depend on the transponder, antennas, control panel, altitude or air-data source, wiring and onboard power supplies. Functional checks must cover the complete installation and the required operating modes. Adjustment, coding and radiated testing are performed only with approved equipment and documentation.

Aircraft application

The transponder is documented on several Soviet and post-Soviet aircraft, including An-72, An-74, An-124, Il-62M, Il-86, Tu-154, Tu-204, Yak-42 and Mi-8 family installations. The Tu-214 is one documented example. Applicability varies with aircraft modification and avionics fit, so the presence of SO-72M in one model does not make every unit or complete set interchangeable.

Identification and ordering of SO-72M

Confirm whether the requirement concerns the SO-72M main unit, a complete transponder set or an individual control or conversion module. State the aircraft type, installed system configuration, connector arrangement, required condition and available passport. Search variants include SO-72M, SO72M and the original Cyrillic СО-72М. Because Latin C/O and Cyrillic С/О can look identical, the marking photograph should be checked before creating purchase documentation.