B18-IAR1

B18-IAR1 fan power unit in the Yadro radio system

B18-IAR1 is an onboard fan power unit used in aircraft HF radio stations of the Yadro family, including Yadro-1 and Yadro-1G1 configurations. The unit supplies power to the cooling fans that provide airflow for radio equipment requiring forced ventilation. It is part of the aircraft radio communication system and works together with the receiver-transmitter equipment, power amplifier, antenna matching unit, control panel and auxiliary blocks of the Yadro radio station.

Cooling support through B18-IAR1

The B18-IAR1 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-IAR1

The B18-IAR1 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-IAR1 in the aircraft radio compartment

The B18-IAR1 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-IAR1

B18-IAR1 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-IAR1

The unit may be referenced as B18-IAR1, B18-YaR1, B18-YAR1, Б18-Яр1 or Б18-ЯР1. 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.

Product Type: Fan power unit for aircraft HF radio station
Designation: B18-IAR1
Alternative Designations: B18-YaR1, B18-YAR1, Б18-Яр1, Б18-ЯР1
Possible Inventory / Export Designation: Fan Power Unit
Drawing / Index Number: I82.087.075
Function: Power supply for cooling fans of the Yadro HF radio station equipment
Purpose: Support of stable fan operation for radio equipment cooling
Application / Where Used: Aircraft HF radio communication systems
Associated Systems: Yadro-1, Yadro-1G1 and related Yadro-family HF radio stations
System / Installation Area: Aircraft radio equipment compartment / radio equipment cooling subsystem
Compatible Aircraft / Equipment: Mi-8, Mi-17 and other aircraft equipped with compatible Yadro-family HF radio stations
Input Voltage: 27 V DC aircraft onboard network
Output Voltage: Approximately 115 V AC
Output Frequency: 400 Hz
Operating Mode: Long-duration continuous operation
Cooling Type: Natural cooling
Protection: Built-in fuse
Typical Mi-8 / Mi-17 Location: Radio compartment on the right side near fuselage frames 14–15, depending on aircraft modification
Condition: As applicable
Technical Documentation: Product passport, aircraft technical documentation and radio station operating documentation upon request

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