GA-3

Function of the GA-3 gyro unit

The main function of GA-3 is stable heading storage and heading signal output during flight. The gyro axis maintains its spatial direction, while aircraft turns are detected by angular sensing elements and converted into electrical heading signals. These signals are used by the aircraft heading system and related navigation equipment. GA-3 is especially important in operating modes where magnetic references are less reliable, including maneuvering flight, turbulence and operation in high-latitude areas.

GA-3 in TKS and GMK heading systems

GA-3 is used in aircraft heading complexes such as TKS-P, TKS-P2, GMK-1G and GMK-1AE, depending on aircraft type and avionics configuration. In these systems, the unit operates together with heading correction equipment, magnetic sensors, control panels and signal distribution circuits. For increased reliability, aircraft heading systems may include two or three GA-3 gyro units, typically arranged as main, control and reserve channels.

Operating modes of the GA-3 gyro aggregate

In DG mode, the GA-3 works as an autonomous directional gyro and stores the selected heading reference. This mode is used for accurate heading holding and stable navigation output. In magnetic correction mode, the gyro unit can be synchronized with a magnetic heading source, such as an induction magnetic sensor, for initial heading alignment or correction during stable straight flight. Latitude correction may also be used to compensate for Earth rotation according to the current flight latitude.

Construction features of GA-3

The GA-3 unit contains a high-speed aircraft gyro motor in a sealed metal housing. The source context indicates the IAV-824 gyro motor or an equivalent type. The rotor operates at high speed, creating the kinetic moment needed for stable directional reference. The unit includes a heating assembly with thermal elements and a bimetallic relay to maintain reliable operation at low temperatures. It may also include a gyro topple warning function when aircraft maneuvers exceed the operating limits of the gimbal suspension.

Installation and maintenance of GA-3

GA-3 is mounted on a special frame with shock absorbers to protect the gyro mechanism from vibration and impact loads. During installation, the base plane must be aligned with the aircraft construction axis according to maintenance documentation. The sealed metal casing may include an inspection window for visual monitoring of the internal gimbal frame. Before procurement or replacement, the required aircraft system, modification, condition, passport availability and test status should be confirmed.