A-037-1V

A-037-1V transceiver in the A-037 Variant 10 set

The A-037-1V is the primary transmitting and receiving unit of the A-037 radio altimeter set, Variant 10. It is designed to measure true aircraft height above land, water or rough terrain and provide altitude data to cockpit indicators and related onboard systems. The unit can be installed on fixed-wing aircraft and helicopters, including Mi-8, Mi-17 and Mi-171 series helicopters, depending on the aircraft configuration. The A-037-1V is not a cockpit display instrument; it is the electronic measuring block of the radio altimeter system.

Operating principle of the A-037-1V

The A-037-1V operates 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 determine true altitude in real time. This gives the crew and onboard systems actual clearance above the surface below the aircraft, not barometric altitude. The measured value is then used by the pointer indicator, low-altitude warning circuit and connected aircraft systems according to the installed configuration.

Altitude measurement range of A-037-1V

For the A-037-1V version, the operating altitude range is specified as 20 to 700 meters. This makes the unit suitable for low-altitude and extended low-altitude flight profiles where continuous terrain or water clearance information is required. The system also supports warning and control outputs within its operating envelope. Since related A-037 transceiver versions may have different ranges and variants, the A-037-1V should be selected by exact designation and checked against the A-037 Variant 10 documentation.

Indication, warning and fault output

In the A-037 system, the A-037-1V provides data for continuous altitude indication on a cockpit pointer indicator. The system can also generate low-altitude warning signals when the aircraft descends below a preset threshold. Depending on the aircraft installation, this warning may be visual and aural. If the system detects a malfunction, loses radar contact with the surface, or the aircraft operates outside the valid altitude range, a fault flag appears on the indicator scale. This tells the crew that the displayed height should not be relied on.

Electronic structure and construction of A-037-1V

The A-037-1V incorporates receiving, transmitting, signal-processing and monitoring circuits. The unit housing is metallic and has a perforated U-shaped top cover. Manual access points for “1RS” and “2RS” adjustments are provided on the block. The transceiver is mounted on standard frame fixtures and connects to the aircraft wiring through the rear connector Ш1-1. Since this block is the electronic core of the A-037 set, its condition directly affects altitude indication, warning output and overall radio altimeter performance.

A-037-1V on Mi-8, Mi-17 and Mi-171 helicopters

The A-037-1V is associated with A-037 Variant 10 installations on Mi-8, Mi-17 and Mi-171 helicopters, as well as other aircraft where the corresponding radio altimeter set is installed. On helicopters, radio altitude is important during approach, landing, hover, descent, flight over water, external-load operation and terrain-clearance monitoring. Exact applicability must be confirmed by the aircraft modification, installed equipment list, wiring diagram and radio altimeter documentation.

Installation, service and supply of A-037-1V

The A-037-1V must be operated and maintained according to aircraft documentation and radio altimeter technical requirements. Before installation, the unit should be checked for condition, passport, service history, connector integrity, completeness, mounting compatibility and test status. During troubleshooting, the full system should be checked: transceiver, antennas, coaxial lines, cockpit indicator, warning circuits, power supply and interconnecting cables. For procurement, the full designation A-037-1V should be stated clearly.

Product Name: Radio Altimeter Transceiver
Part Number: A-037-1V
Product Type: Radar altitude measuring unit / transmitting-receiving unit
Function: Measurement of true altitude above ground, water or rough terrain
Operating Principle: Continuous-wave radar with frequency modulation
System Application: A-037 radio altimeter set, Variant 10
Operating Altitude Range: 20–700 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
Installation / Mounting: Standard frame fixtures; rear connector Ш1-1
Adjustment Access Points: “1RS” and “2RS”
Typical Installation Platforms: Mi-8, Mi-17, Mi-171 helicopters and other aircraft on request
Condition: As applicable
Alternate Designations: A-037-1V; A037-1V; A 037 1V; A-037-1V transceiver
Documentation: Product passport and operation manual

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