8-1930-720A

Hydraulic Damper Cylinder for Mi-8 / Mi-17 Main Rotor Hub

The 8-1930-720A hydraulic damper cylinder is a double-acting hydraulic component installed in the main rotor hub assembly of Mi-8 and Mi-17 helicopters. The unit is designed to damp oscillations of rotor blades in the plane of rotation and ensure dynamic stability of the rotor system during ground and flight operation.

Function within Rotor Hub Assembly 8-1930-000

The cylinder operates as part of the hydraulic damping system of hub 8-1930-000 (Series 2 and above). It absorbs cyclic blade loads and reduces dynamic instability, including suppression of ground resonance phenomena typical for articulated rotor systems.

Design Characteristics and Operational Role

The unit is manufactured from high-strength aviation alloys resistant to alternating loads and corrosion. The damper operates with approved aviation hydraulic fluids such as AMG-10 in accordance with helicopter maintenance documentation and overhaul procedures.

Installation and Aircraft Compatibility

The 8-1930-720A damper cylinder is installed between the hub body and the blade pitch control lever in Mi-8, Mi-8T, Mi-8MT, and Mi-17 helicopters as part of the main rotor hydraulic damping mechanism.

Product Type: Double-acting hydraulic damper cylinder
Function: Damping of main rotor blade oscillations in the plane of rotation
Application / Where Used: Main rotor hub hydraulic damping system
System / Installation Area: Main rotor hub assembly
Part of System / Included in Set: Main rotor hub 8-1930-000 (Series 2 and above)
Compatible Aircraft / Equipment: Mi-8, Mi-8T, Mi-8MT, Mi-17 helicopters
Working Medium: Aviation hydraulic oil (AMG-10 or approved equivalent)
Installation Location: Between hub body and blade pitch control lever
Technical Documentation: Manufacturer technical documentation and aircraft maintenance documentation

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Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.