VK-53E-RV Series 5

VK-53E-RV Series 5 correction switch

The VK-53E-RV Series 5 is an aircraft correction switch used in onboard navigation and flight-control equipment. It is associated with helicopter applications, including Mi-8-family aircraft, and belongs to aircraft test / control and instrumentation equipment categories. The unit is used in circuits where correction signals of gyro instruments must be disconnected during turns. In catalog references, the product is identified as a correction switch with the designation VK-53E-RV Series 5 and may appear in spare parts databases for Mi-8 helicopter equipment.

Correction cut-off during aircraft turns

The main role of the VK-53E-RV is to prevent false correction of gyro instruments when the aircraft is turning. During a turn, pendulous liquid correction devices may be affected by centrifugal forces and no longer indicate the true vertical correctly. If their signals were applied without interruption, they could introduce error into gyro-based instruments or heading systems. The VK-53E-RV detects turn rate and temporarily disconnects longitudinal and lateral correction circuits when the turn exceeds the specified threshold. This keeps the correction system from acting on misleading input.

Turn-rate sensing in VK-53E-RV

The VK-53E-RV works with an internal gyro motor assembly, commonly associated with GMA-4P-type elements in this class of equipment. The unit reacts to angular velocity around the aircraft vertical axis. When the measured turn rate exceeds the threshold, the switch changes state and sends the required correction cut-off command. When the turn stops or the angular velocity falls below the threshold, the correction circuits are restored after a short delay. This delay logic helps avoid unnecessary switching during short disturbances, vibration or brief aircraft motion.

Use with gyro and heading systems

The VK-53E-RV may be used with gyro instruments and heading systems where longitudinal and lateral correction must be blocked during maneuvering. In practical aircraft systems, this can include gyro-magnetic heading equipment such as GMK-series systems, depending on aircraft wiring and configuration. The unit does not generate heading information by itself. Its task is supervisory and protective: it decides when correction inputs should be temporarily isolated so that gyro instruments do not receive incorrect correction during a turn.

Aircraft application of VK-53E-RV

The VK-53E-RV Series 5 is listed as a helicopter spare part and is associated with Mi-8 applications. Related correction switch versions may be used on Mi and Ka helicopters and on other aircraft with compatible correction circuits. Because the VK-53 family includes versions such as VK-53E-RB and VK-53E-RSh, the exact suffix and series should be checked before replacement. The suffix may relate to connector execution, installation features or mounting arrangement, depending on the specific documentation and aircraft installation.

Inspection and maintenance of VK-53E-RV

During inspection, the VK-53E-RV is checked for power supply, threshold response, delay timing, restoration of correction, connector condition and continuity of switching circuits. Since the unit is involved in correction cut-off logic, faults may appear as correction not disconnecting during turns, correction staying disconnected after the turn, false triggering or failure of related gyro instruments to behave normally. The switch should be tested according to the applicable maintenance manual and bench-check procedure for the specific aircraft system.

Supply and identification of VK-53E-RV

For procurement, the full designation VK-53E-RV Series 5 should be used. It is also useful to specify the aircraft type, system where the unit will be installed, connector version, required condition and documentation. Catalog data identifies the product as a correction switch for Mi-8 helicopter spare parts, with OKP code 754515081003 and product type KIA. For aircraft supply, passport, label, storage condition, test status and compatibility with the installed correction system should be confirmed before installation.

Product Type: Aircraft correction switch / correction cut-off unit
Designation: VK-53E-RV Series 5
Russian Designation: ВК-53Э-РВ сер.5
Function: Automatic disconnection of correction circuits during aircraft turns
Application / Where Used: Navigation, gyro instrument and automatic-control correction circuits
System / Installation Area: Onboard aircraft / helicopter equipment, correction control circuits
Catalog Product Type: KIA
OKP Code: 754515081003
Associated Aircraft: Mi-8 helicopter applications; other Mi / Ka helicopters depending on configuration and documentation
Related Versions: VK-53E-RB, VK-53E-RSh and other VK-53-family executions
Measured Parameter: Angular velocity of aircraft turn around the vertical axis
Internal Sensing Element: Gyro motor assembly, commonly associated with GMA-4P-type equipment in this class
Correction Circuits Affected: Longitudinal and lateral correction circuits of gyro instruments / heading systems, depending on installation
Actuation Threshold: Approximately 0.1–0.3°/s turn rate
Actuation Accuracy: Not more than ±0.05°/s from set threshold
Correction Cut-Off Delay: Approximately 5.7–15 s after turn rate exceeds threshold
Correction Restoration Time: Approximately 2–3 s after turn stops or turn rate falls below threshold
AC Power Supply: 36 V ±10%, 400 Hz
DC Power Supply: 27 V DC nominal
DC Current Consumption: Not more than 0.5 A
Operating Mode: Continuous
Operating Temperature Range: −60 to +60 °C
Housing: Sealed, dust- and moisture-protected execution
Technical Documentation: Product passport, aircraft maintenance documentation, wiring diagrams and test procedure as applicable

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