Technical Description
Final tail gearbox located at the end of the tail drive system. It receives torque from the tail shaft and delivers it to the tail rotor at the required orientation and reduction ratio. Gear/bearing condition, oil-system status and output-shaft/flange condition must be checked during overhaul or procurement.
Verification Status
High – listed for Mi-171/Mi-17 family.
Source
https://www.sun-av.aero/our-services/parts-component-supply/parts-for-mi-8-17-26-helicopters/
Identification Note
The photograph is provided for reference. Procurement identification must be based on data plate markings, P/N, S/N, approved configuration and airworthiness documentation, not visual appearance alone.






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