RA-37K (6L4.137.183)

Mechanical support function of RA-37K

The main function of the RA-37K is mechanical installation and fixation of onboard equipment. The frame keeps the connected units aligned with the aircraft mounting points and connector interface. This is important because recorder equipment must remain stable during vibration, maneuvering, takeoff, landing and normal helicopter operation. A damaged or incorrect mounting frame can lead to poor seating of the blocks, connector stress, unreliable electrical contact or incorrect installation of the recording system components.

RA-37K in the BUR-1-2 system

The RA-37K is used as part of the BUR-1-2 onboard flight data recorder system. In this system, it supports the installation of the functional blocks that collect, process and record flight parameter information. The frame is commonly listed as part of the system configuration together with units such as BSPI-4-2, PU-25 and protected onboard storage units depending on the exact BUR version. When checking system completeness, the mounting frame should be treated as a required installation element, not as optional hardware.

Installation of RA-37K on Mi-8 family helicopters

The RA-37K is applied on Mi-8 family helicopters, including Mi-171E, where BUR-1-2 flight data recording equipment is installed. The frame is normally mounted in an equipment compartment or designated avionics / recorder installation area according to the helicopter documentation. Exact location depends on the aircraft modification and system layout. During replacement, the frame part number, mounting holes, shock-mounted elements, connector position and compatibility with the installed recorder blocks should be checked.

RA-37K and vibration protection of recorder equipment

Flight data recording equipment must operate in a high-vibration aircraft environment. The RA-37K helps reduce the influence of vibration and mechanical loads on the installed units by providing stable mounting and, where applicable, shock-absorbing support. This is especially important for recorder systems because poor mechanical installation can affect connectors, internal components and recording reliability. During maintenance, technicians should inspect the frame for cracks, deformation, loose fasteners, damaged shock absorbers and signs of corrosion.

Identification and supply of RA-37K

For procurement or replacement, the full designation RA-37K / RA-37K should be specified, along with the part number 6L4.137.183. It is also useful to confirm the aircraft type, recorder system version and required scope of supply. The frame may be needed as a separate spare part or as part of a complete BUR-1-2 system set. Before installation, the unit should be checked for correct marking, mounting condition, completeness, mechanical integrity and compatibility with the target aircraft installation.