A-037-1G

A-037-1G transceiver in the A-037 radio altimeter system

The A-037-1G is a primary transmitting and receiving unit of the A-037 radio altimeter system, Variant 04. It is used to measure true aircraft height above terrain, water or uneven surfaces and provides altitude data for cockpit indication and onboard warning systems. The unit can be installed on fixed-wing aircraft and helicopters, including Mi-8, Mi-17 and Mi-171 platforms, depending on the installed equipment configuration. The A-037-1G is not a cockpit display instrument; it is the electronic measuring block of the radio altimeter set.

Operating principle of the A-037-1G

The A-037-1G works as a continuous-wave radar with frequency modulation. The transceiver sends a radio-frequency signal toward the surface below the aircraft, receives the reflected return and processes the signal difference to calculate true altitude in real time. This gives the aircraft actual height above the surface underneath it, not barometric altitude. The resulting data are used by pointer indicators, warning circuits and other connected onboard systems where low-altitude information is required.

Altitude measurement range of A-037-1G

The A-037-1G is specified for an operating altitude range from 20 to 300 meters. This range is intended for low-altitude flight monitoring, terrain-clearance awareness and safety control near the surface. The system also provides defined altitude pulse outputs and danger-altitude warning accuracy within the specified limits. Since related A-037 transceiver versions may have different system variants and ranges, the A-037-1G should be selected according to its own documentation and the A-037 Variant 04 configuration.

System warning and fault indication

In the A-037 system, the A-037-1G provides altitude data to cockpit indicators and warning devices. The system can support a visual and aural warning when the aircraft descends below the selected danger-height threshold. If the radio altimeter detects a malfunction, loses reliable reflection from the surface or operates outside the valid altitude envelope, the connected indicator provides a fault indication. For the crew, this is a clear warning that the displayed altitude must not be relied on until the system is checked.

Electronic structure of the A-037-1G

The A-037-1G integrates transmitting, receiving, signal-processing and monitoring circuits in one transceiver unit. It is the core electronic module of the A-037 radio altimeter system and works together with cockpit indicators, antennas, wiring and warning circuits. The block processes reflected radar signals and generates the outputs required by the aircraft indication and warning equipment. Because of this, troubleshooting should always include the full system: the transceiver, antennas, cables, connectors, power supply, indicator and associated protection circuits.

Application on Mi-8, Mi-17 and Mi-171 helicopters

The A-037-1G may be used on Mi-8, Mi-17 and Mi-171 helicopters, as well as other aircraft equipped with the corresponding A-037 radio altimeter configuration. On helicopters, radio altitude is especially important during approach, landing, hovering, descent, external-load operation, flight over water and terrain-clearance monitoring. Exact applicability must be confirmed by the aircraft modification, equipment list, wiring diagram and the radio altimeter documentation for the installed system version.

Identification and supply of A-037-1G

For procurement, the full designation A-037-1G should be used. Alternative spellings such as A037-1G, A 037 1G or A-037-1G Transceiver may appear in English-language requests, but the exact part number remains the main reference. In Russian-language documentation, the correct designation is А-037-1Г. Before installation, the unit should be checked for condition, passport, operation manual, connector integrity, mounting compatibility, completeness, storage history and test status.

Product Name: Radio Altimeter Transceiver
Part Number: A-037-1G
Product Type: Radar altitude measuring unit / transmitting-receiving unit
Function: Measurement of true altitude above ground, water or uneven surfaces
Operating Principle: Continuous-wave radar with frequency modulation
System Application: A-037 radio altimeter system, Variant 04
Operating Altitude Range: 20–300 m
Residual Altitude H₀: 7.2 m
Measurement Error, 95%, H1/H3 Outputs up to 20 m: ±0.6 + 0.05·H
Measurement Error, 95%, Above 60 m: ±0.6 + 0.05·H
Analog Indication Error, 0–20 m: ±2 m
Calibration Error on K-5 Delay Line, H1/H3 Analog Outputs: ±(0.3 + 0.03·H)
Indicator Calibration Error: ±0.05·H
Overall Sensitivity on K-5 Line: ≥87 dB
Altitude Pulse Outputs, 1RS / 2RS: 5–750 m
Danger-Altitude Signal Error, 0–20 m: ±1 m
Danger-Altitude Signal Error Above 20 m: ±2 m
Aural Signal Duration: 3–9 s
Indicator Backlight: White / red
Control-Mode Altitude Indication: 15 ±2 m
Power Consumption from 115 V, 400 Hz Supply: Up to 10 VA
Power Consumption from 27 V DC Supply: Up to 30 W
Unit Mass: 6.8 ±0.3 kg
Application / Where Used: A-037 radio altimeter system, Variant 04
Compatible Aircraft / Equipment: Mi-8, Mi-17, Mi-171 helicopters and other aircraft, depending on documentation
Condition: As applicable
Alternate Designations: A-037-1G; A037-1G; A 037 1G; A-037-1G Transceiver
Technical Documentation: Product passport and operation manual

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