B18-YAR1

Cooling support through B18-YAR1

The B18-YAR1 unit provides electrical power for the fan system used to cool radio equipment during operation. In Yadro-family HF radio stations, stable cooling is important because transmitter and receiver-transmitter blocks can generate heat during prolonged operation, especially in transmission modes. The fan power unit supports continuous fan operation and helps maintain normal thermal conditions inside the radio equipment installation. It should be checked together with the fans, wiring, fuses, connectors and related radio station blocks.

Power conversion function of B18-YAR1

The B18-YAR1 receives 27 V DC from the aircraft onboard electrical network and supplies alternating current for the fan circuit. According to the provided technical data, the output is approximately 115 V AC at 400 Hz. The unit is intended for long-duration continuous operation and includes built-in fuse protection. It does not perform radio signal transmission or reception; its role is to support the cooling subsystem required for reliable operation of the Yadro HF radio station equipment.

Installation of B18-YAR1 in the aircraft radio compartment

The B18-YAR1 unit is installed in the aircraft radio equipment compartment. On Mi-8 / Mi-17 family helicopters, the unit may be mounted on the right side of the radio compartment near fuselage frames 14–15, depending on aircraft modification and radio station installation. This location places the fan power unit close to the radio equipment it supports. During maintenance, technicians should inspect the unit mounting, fuse condition, connectors, wiring, ventilation area and signs of overheating or electrical damage.

Aircraft application of B18-YAR1

B18-YAR1 is used on civil and military helicopters and aircraft equipped with compatible Yadro-family HF radio stations. Typical application includes Mi-8 and Mi-17 helicopters, as well as other aircraft fitted with Yadro-1 or Yadro-1G1 shortwave communication equipment. Since radio station installations can differ by aircraft type, modification and modernization status, applicability should be confirmed through the aircraft equipment list, wiring documentation and operating documentation of the installed radio station.

Identification and ordering of B18-YAR1

The unit may be referenced as B18-YAR1, B18-YAR1, B18-YAR1, B18-YAr1 or B18-YAR1. In English-language inventories, it may be listed as “Fan Power Unit”. The drawing / index number may be specified as I82.087.075. These designations should be checked against the actual marking plate and aircraft documentation before ordering. For correct supply, it is useful to specify the aircraft type, installed Yadro radio version, required condition, connector configuration, documentation set and whether cooling fans or related wiring are also required.