CGV-4 Series 4

CGV-4 Series 4 central gyroscopic vertical

CGV-4 Series 4 is an aircraft central gyroscopic vertical used to determine and transmit roll and pitch angle signals to onboard systems. The unit provides an attitude reference relative to the true vertical and is used in flight-navigation complexes, attitude indication systems and automatic flight control equipment. It is applied in civil and military aircraft systems where reliable roll and pitch data are required for cockpit indication, navigation calculations and autopilot operation.

Function of the CGV-4 attitude reference unit

The main function of CGV-4 Series 4 is continuous determination of aircraft attitude angles. The unit measures roll and pitch and issues corresponding electrical signals to aircraft consumers. These signals may be used by command flight director instruments, attitude indicators, navigation computers and automatic control systems. Since the CGV-4 is a central vertical reference unit, it is normally installed as part of the aircraft avionics system rather than as a standalone cockpit display.

Operating principle of CGV-4 Series 4

CGV-4 is built around two two-degree gyroscopes with mutually perpendicular precession axes. This arrangement allows the instrument to maintain a vertical reference and generate roll and pitch outputs for connected equipment. The system uses correction circuits to reduce drift and maintain vertical accuracy during flight. According to the source context, the unit can provide stable vertical reference in straight and level flight and on an oscillating base within specified limits.

Signal output and connected systems

CGV-4 Series 4 uses potentiometric signal output for roll and pitch channels, according to the source context. The output signals are transmitted to autopilot channels, attitude indication equipment, command flight director instruments and navigation computers. In aircraft installations, the unit may work with systems such as KPPM, AGD-type indication equipment or other onboard consumers depending on the aircraft configuration. Exact integration should be verified through the aircraft wiring and avionics documentation.

Power supply and operation of CGV-4

The CGV-4 Series 4 unit operates from standard Soviet / Russian aircraft power supplies. The source context indicates three-phase 36 V AC at 400 Hz and 27 V DC power. The AC supply is used for gyro motor operation, while DC circuits are associated with control, correction and signal functions depending on installation. After power-up, the gyros require a start-up period to reach operating speed and establish the vertical reference before the unit is ready for normal output.

Installation and ordering of CGV-4 Series 4

CGV-4 Series 4 is installed as an avionics unit in protected aircraft equipment areas using a mounting arrangement with shock isolation. The exact position depends on the aircraft type and system layout. When ordering, the buyer should confirm the precise series, aircraft application, condition, passport availability, repair certificate and test status. Since Series 4 / Series 04 may refer to a specific electrical and mechanical execution, substitution with another CGV-4 version should be checked against system documentation.

Product Type: Central gyroscopic vertical / aircraft attitude reference unit
Designation: CGV-4 Series 4
Alternative Designations: CGV-4 Series 04, CGV-4 ser.4, CGV-4 ser.04, ЦГВ-4 серия 4, ЦГВ-4 серия 04
Function: Determination and output of aircraft roll and pitch angle signals
System Type: Central gyroscopic vertical based on two two-degree gyroscopes
Gyro Arrangement: Two gyroscopes with mutually perpendicular precession axes, according to source context
Application / Where Used: Flight-navigation complexes, attitude indication systems and automatic flight control systems
Output Consumers: Autopilot, attitude indicators, command flight director instruments and navigation computers
Signal Output Type: Potentiometric output of roll and pitch signals, according to source context
Associated Indication Systems: KPPM / AGD-type equipment and other consumers depending on aircraft configuration
Measured Parameters: Roll angle and pitch angle
AC Power Supply: Three-phase 36 V ±10%, 400 Hz
DC Power Supply: 27 V DC; nominal aircraft network may be 28.5 V according to source context
Start-Up Time: Up to 3–5 minutes
Vertical Accuracy in Straight and Level Flight: Not worse than ±15 angular minutes, according to source context
Vertical Accuracy on Oscillating Base: Not worse than ±15 angular minutes at oscillation angles up to 5°, according to source context
Error After Maneuvers: Not more than ±2° after turns and maneuvers, according to source context
Correction Precession Rate: 0.7° to 2° per minute
Operating Temperature Range: −60 °C to +50 °C
Dimensions: 242 × 234 × 274 mm
Weight: Not more than 8.5 kg, without mounting frame and cables according to source context
Mounting: Aircraft mounting position with shock-isolated frame / mounting base depending on installation
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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