GU4.137.080-01

GU4.137.080-01 frame in the A-037 radio altimeter system

The GU4.137.080-01 is a mounting frame used for installation and securing of A-037 radio altimeter transceiver units. It is a mechanical component of the system, designed to hold the transceiver in the helicopter avionics or equipment bay. The frame does not measure altitude, process signals or route electrical power. Its role is structural: it provides a stable mounting base for the A-037-1 series transceiver during flight, vibration and normal aircraft operating loads.

Mechanical role of the GU4.137.080-01

The main function of the GU4.137.080-01 is to secure the transceiver unit on the equipment rack. In flight, avionics blocks are exposed to vibration, acceleration and dynamic loads, so the transceiver must be fixed in a way that prevents movement, stress on connectors and damage to the unit housing. The mounting frame helps keep the block in its correct installed position and supports reliable operation of the complete radio altimeter system by maintaining proper mechanical stability.

Compatibility with A-037-1 series transceivers

The GU4.137.080-01 mounting frame is compatible with A-037-1A, A-037-1V and A-037-1G transceiver versions, depending on the installed A-037 radio altimeter configuration. It may be used across different A-037 system variants, including Variant 4, Variant 10, Variant 11 and other configurations where A-037-1 series transceiver units are installed. Compatibility should still be checked against the aircraft equipment list and the radio altimeter documentation before supply or replacement.

GU4.137.080-01 as a non-electrical component

The GU4.137.080-01 is not an electronic unit and has no independent operating function. It does not transmit or receive radio signals, does not provide altitude data and does not participate in cockpit indication. The frame also does not perform power or signal routing unless used together with separate wiring elements specified in the aircraft documentation. For supply purposes, it should be treated as a structural mounting component, not as part of the electrical measuring circuit of the A-037 system.

Installation in the helicopter avionics bay

The frame is installed inside the helicopter avionics or equipment bay, where the A-037 transceiver is mounted on an equipment rack or designated installation point. Correct installation is important because the transceiver must remain fixed and aligned with the aircraft’s wiring, connector access and maintenance layout. During installation, the mounting condition, fastening points, frame integrity and compatibility with the specific transceiver version should be checked according to the approved aircraft documentation.

Inspection and service notes for GU4.137.080-01

During maintenance, the GU4.137.080-01 should be inspected for deformation, cracks, corrosion, damaged fastening points, worn mounting surfaces and signs of previous improper installation. Since the frame supports the transceiver physically, even a purely mechanical defect can affect reliability of the complete A-037 system. Loose mounting or damaged frame geometry may lead to vibration, connector stress, intermittent faults or difficulty securing the transceiver properly in the equipment bay.

Identification and supply of GU4.137.080-01

For procurement, the full designation GU4.137.080-01 should be used. Alternative references such as GU4-137-080-01, A-037 mounting frame or frame for A-037-1 transceivers can help identify the part, but the exact designation remains the key reference. Before supply, it is useful to confirm the target radio altimeter variant, transceiver type, required condition and availability of system documentation. The frame is normally documented as part of the A-037 radio altimeter installation set.

Product Name: Mounting Frame
Part Number: GU4.137.080-01
Product Type: Mechanical mounting component
Function: Mechanical securing of the transceiver unit
System Application: A-037 radio altimeter system
Installed In: Helicopter avionics / equipment bay
Role in System: Structural support and vibration-resistant installation
Compatible Transceivers: A-037-1A; A-037-1V; A-037-1G
Applicable System Variants: A-037 Variant 4, Variant 10, Variant 11 and other configurations using A-037-1 series transceivers
Electrical Function: Not applicable; no signal or power routing
Independent Operation: Not applicable
Installation Type: Mounting on equipment rack / designated frame position
Condition: As applicable
Alternate Designations: GU4.137.080-01; GU4-137-080-01; A-037 mounting frame; frame for A-037-1 transceivers
Documentation: Included in A-037 system passport and aircraft installation documentation

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