458MKS Series 2

458MKS Series 2 gyro sensor for aircraft attitude systems

458MKS Series 2 is an aircraft gyroscopic sensor used as a compact gyro-vertical unit for issuing electrical AC signals proportional to aircraft roll and pitch angles. The unit is used in remote attitude indicator systems such as AGD-1 and AGD-1S, together with cockpit indicators of the 1122A / 1122B type, depending on system configuration. It may also transmit attitude data to onboard recording systems and autopilot channels.

Function of the 458MKS Series 2 gyro sensor

The main function of the 458MKS Series 2 unit is to determine aircraft spatial position relative to the true horizon and transmit roll and pitch data to remote consumers. The gyro sensor is not mounted on the pilot’s instrument panel. It is installed inside the aircraft fuselage in a protected equipment area, while the cockpit receives the output through dedicated indicators. This arrangement allows the sensitive gyro unit to be placed in a stable structural zone and still provide continuous attitude data to the crew and aircraft systems.

Critical roll angle signalling in 458MKS

The main difference between 458MKS Series 2 and the basic 458M version is the additional critical roll angle signalling function. The unit generates discrete electrical signals when the aircraft reaches specified roll thresholds. According to the source context, these thresholds are ±(15 ±1.5)° and ±(32 ±2)°. These discrete outputs may be used by warning, recording or automatic systems that require fixed roll-angle reference points in addition to continuous roll and pitch signals.

Measurement range and correction features

458MKS Series 2 measures roll and pitch angles over a full 360-degree range, except for the structural blind zone near high climb or dive pitch attitudes. The source context indicates a blind zone around 85°–95°, where gimbal alignment limits the mechanical gyro system. The unit uses pendulum correction channels to maintain vertical reference. Transverse and longitudinal correction rates are specified separately, and correction can be disabled within defined acceleration-related angles to reduce false correction during maneuvering or non-stabilized flight.

Aircraft installation of 458MKS Series 2

458MKS Series 2 is installed inside the fuselage in aircraft technical compartments, underfloor spaces, radio bays or protected forward equipment areas, depending on aircraft type. It is mounted on dedicated frames or rigid mounting points tied to fuselage structural members near the aircraft center of gravity where possible. Correct orientation is essential: the longitudinal axis of the unit must align with the aircraft longitudinal axis, the transverse axis with the wing plane, and the base must be installed horizontally according to maintenance documentation.

Application and procurement of 458MKS Series 2

The 458MKS Series 2 gyro sensor is used on aircraft fitted with AGD-type remote attitude systems and critical roll signalling circuits. Source context indicates application on MiG-21, regional aircraft, Mi-8 helicopters and other Soviet / Russian aircraft depending on configuration. For procurement, the buyer should confirm exact designation, aircraft type, installation system, condition, passport availability, repair certificate and test status. Since 458M, 458MKS and 458MB variants differ by outputs and system role, substitution should be checked through aircraft documentation.

Product Type: Aircraft gyro sensor / compact gyro-vertical unit
Designation: 458MKS Series 2
Alternative Designations: 458MKS ser.2, 458МКС серия 2, гиродатчик 458МКС серия 2
Function: Output of electrical AC signals proportional to aircraft roll and pitch angles
Additional Function: Discrete signalling at critical roll angles
Parent Systems: AGD-1, AGD-1S remote attitude indicator systems according to source context
Associated Indicators: 1122A / 1122B angle indicators, according to source context
Application / Where Used: Aircraft attitude indication, onboard recording, autopilot and stabilization systems
Compatible Aircraft / Equipment: MiG-21, Mi-8, regional aircraft 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
Critical Roll Signal Thresholds: ±(15 ±1.5)° and ±(32 ±2)°
Signal Output: AC electrical roll and pitch signals plus discrete critical roll signals
DC Power Supply: 27 V ±2.7 V
DC Current Consumption: Up to 0.4 A
AC Power Supply: Three-phase 36 V ±2 V, 400 Hz ±8 Hz
AC Current Consumption: Up to 1.35 A in phases I–II, up to 0.9 A in phase III
Power Consumption: Not more than 60 W
Readiness Time: Not more than 1 minute after power-on
Static Signal Error: Not more than ±1° in roll and pitch on stationary base
Flight Error Reference: Up to ±3° after 180° turn at 3°/s, according to source context
Gyro Drift with Correction Off: Less than 5° in roll and less than 4.5° in pitch over 5 minutes
Transverse Pendulum Correction Rate: 2° to 8° per minute
Longitudinal Pendulum Correction Rate: 1° to 3° per minute
Correction Cut-Off Angles: Within 4°–8° under longitudinal / transverse accelerations, according to source context
Dimensions: 206 × 130 × 140 mm
Weight: Not more than 4.0 kg
Installation Area: Protected fuselage equipment compartments, underfloor areas, radio bays or forward technical compartment depending on aircraft type
Mounting Requirement: Rigid orientation relative to aircraft structural axes on a dedicated mounting frame
Related Modifications: 458M Series 2, 458MB Series 2
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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Warranty
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Extended warranty is available upon request and is agreed individually; it may affect the final product price.