458M Series 2

458M Series 2 gyro sensor for remote attitude indication

458M Series 2 is an aircraft gyro sensor used as a remote vertical reference unit for issuing electrical AC signals proportional to aircraft roll and pitch angles. The unit is associated with the AGD-1 remote gyroscopic attitude indicator system and can work with cockpit angle indicators such as 1122A or 1122B, depending on system configuration. The 458M Series 2 sensor provides attitude data to cockpit indication, automatic control equipment and related onboard systems.

Function of the 458M Series 2 gyro sensor

The main function of the 458M Series 2 gyro sensor is to determine the spatial position of an aircraft relative to the true horizon. It measures roll and pitch and transmits these values electrically through built-in selsyn transmitters. The receiving equipment then displays or uses these signals for flight control and stabilization tasks. The sensor is installed remotely from the cockpit indicator, which allows the attitude reference unit to be mounted in a protected equipment bay while the pilot receives indication on the instrument panel.

458M Series 2 in the AGD-1 system

The 458M Series 2 gyro sensor was originally used as the vertical reference sensor for the AGD-1 remote attitude indicator. In this configuration, the sensor forms the attitude signal, while cockpit indicators display aircraft roll and pitch to the crew. The system architecture allows one gyro sensor to serve remote indication and, depending on aircraft wiring, related automatic flight control circuits. For this reason, the unit is often referred to as the AGD-1 attitude indicator gyro sensor.

Measurement range and operating features

The 458M Series 2 sensor measures roll and pitch angles over a full 360-degree range, except for the structural blind zone around high pitch angles where the gimbal axes approach alignment. The source context indicates a blind zone in the 85°–95° pitch area during climb or dive attitudes. The unit is intended to provide stable signals during normal flight modes and permitted aerobatic attitudes. Accuracy is maintained through gyro correction systems, including pendulum correction with defined precession rates.

458M, 458MKS and 458MB modifications

The 458 family includes several related modifications. The 458M Series 2 is the basic serial gyro sensor version. The 458MKS Series 2 modification performs the same main attitude signal function and additionally generates discrete electrical commands when critical roll angles are reached. The source context also mentions the 458MB Series 2 specialized modification. Because the modifications can differ by output signals, wiring and system role, the exact designation and aircraft installation must be checked before replacement.

Aircraft application and maintenance of 458M Series 2

The 458M Series 2 gyro sensor is used on aircraft fitted with AGD-1 / AGD-1S remote attitude indicator systems. Source context indicates application on L-39, L-29, Yak-18T, An-24, An-26, An-12, Il-18, Tu-134 and some Mil and Kamov helicopter configurations, including older Mi-8 stabilization systems. For procurement, the buyer should confirm the exact aircraft system, condition, passport availability, repair certificate and test status. The unit should be supplied and installed according to aviation maintenance documentation.

Product Type: Aircraft gyro sensor / remote vertical reference gyro unit
Designation: 458M Series 2
Alternative Designations: 458M ser.2, 458M Series 2 gyro sensor, 458М серия 2, гиродатчик 458М серия 2
Function: Output of electrical AC signals proportional to aircraft roll and pitch angles
Parent System: AGD-1 / AGD-1S remote gyroscopic attitude indicator system
Associated Indicators: 1122A and 1122B angle indicators, according to source context
Application / Where Used: Aircraft attitude indication, automatic flight control and stabilization systems
Compatible Aircraft / Equipment: L-39, L-29, Yak-18T, An-24, An-26, An-12, Il-18, Tu-134, Mi-8 and other aircraft depending on documentation
Measured Parameters: Roll angle and pitch angle
Measurement Range: Full 360° in roll and pitch, except structural blind zone
Blind Zone: Approximately 85°–95° in climb / dive pitch attitudes, according to source context
Signal Output: AC electrical signals via built-in selsyn transmitters
AC Power Supply: Three-phase 36 V ±2 V, 400 Hz
DC Power Supply: 27 V ±2.7 V
AC Current Consumption: Not more than 0.9 A in phases I and II, not more than 0.8 A in phase III
DC Current Consumption: Not more than 0.3 A
Readiness Time: Not more than 1.5 minutes after power-on
Gyro Drift with Correction Off: Not more than ±2.5° over 5 minutes on oscillating base, according to source context
Vertical Reference Accuracy: Not worse than ±1° at angles from 0° to 30°, according to source context
Pendulum Correction Precession Rate: 1.8° to 6° per minute
Construction: Rigid cast metal housing with inspection window
Approximate Dimensions: 175 × 180 × 295 mm
Weight: Not more than 7.0 kg
Installation: Remote installation in aircraft equipment compartments, underfloor areas or radio bays depending on aircraft type
Related Modifications: 458MKS Series 2, 458MB Series 2
458MKS Additional Function: Discrete electrical signals at roll angles ±(15 ±1.5)° and ±(32 ±2)°, according to source context
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, repair certificate, test report, storage records and aircraft system documentation if available

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