246-3901-000 Series 01

Tail rotor hub 246-3901-000 Series 01

246-3901-000 Series 01 is a helicopter tail rotor hub used on Mi-8 family helicopters and related models. The hub is one of the main load-bearing components of the tail rotor assembly and works in the anti-torque system of the helicopter. Its role is connected with yaw control, where the tail rotor produces lateral thrust to compensate for main rotor torque and control the helicopter around the vertical axis. The hub operates together with tail rotor blades, pitch-change elements, bearings, control linkage and the tail gearbox output.

Control input transmission through 246-3901-000 Series 01

The 246-3901-000 Series 01 hub transmits control inputs from the tail rotor control system to the tail rotor blades. These inputs change blade pitch, allowing the tail rotor to vary thrust according to pilot command and flight condition. In normal operation, this pitch variation is continuous and must remain smooth, predictable and mechanically reliable. Since the hub carries aerodynamic, centrifugal and control loads from the rotating blade set, its condition directly affects tail rotor response, vibration level and yaw control stability.

246-3901-000 Series 01 in a three-blade tail rotor assembly

The 246-3901-000 Series 01 is installed as part of a three-blade variable-pitch tail rotor assembly. It provides the central mechanical interface between the tail gearbox output and the tail rotor blades. The hub holds the blades in the required geometry while allowing their pitch angle to change through the control mechanism. This combination of structural support and controlled blade movement is what allows the tail rotor to produce the required anti-torque thrust. The hub should therefore be inspected and maintained as part of the complete tail rotor assembly, not as an isolated component.

Installation area of the 246-3901-000 Series 01 hub

The 246-3901-000 Series 01 hub is installed at the tail rotor assembly on the helicopter tail boom. It works at the end of the tail rotor drive train, after torque has passed through the main gearbox, intermediate gearbox, tail shaft system and tail gearbox. The hub is connected to the blade set and control mechanism, so correct installation, alignment and documentation compliance are important. During replacement or overhaul, maintenance personnel normally verify hub condition, blade compatibility, attachment points, control movement, lubrication requirements and logbook records.

Aircraft application of 246-3901-000 Series 01

The 246-3901-000 Series 01 tail rotor hub is used on Mi-8, Mi-14, Mi-17, Mi-24 and related helicopter models, depending on the installed tail rotor system and aircraft documentation. The hub can be found in both civil and military helicopter applications where the compatible Mi-family tail rotor assembly is installed. Since helicopter configurations may differ by modification, overhaul history, blade set and service bulletin status, applicability should be confirmed through the aircraft parts catalog and operational documentation before supply or installation.

Identification and ordering of 246-3901-000 Series 01

The product may be referenced as 246-3901-000 Series 01. The series designation should be included in the request because tail rotor hub configuration and documentation can matter for compatibility. The hub is associated with tail rotor blades 246-3925-00 and is manufactured by Moscow Machine-Building Plant “Vpered”. For correct supply, it is useful to specify the helicopter type, installed tail rotor assembly, compatible blade set, required condition, logbook availability and operational documentation. A photo of the marking plate can also help confirm the exact version before shipment.

Product Type: Tail rotor hub
Designation: 246-3901-000 Series 01
Alternative Designations: 246-3901-000 Ser. 01, 2463901000 Series 01
Function: Transmission of control inputs and blade pitch variation for yaw control
Application / Where Used: Helicopter tail rotor systems
System / Installation Area: Tail rotor assembly, tail boom
Part of System / Included in Set: Tail rotor assembly
Compatible Aircraft / Equipment: Mi-8, Mi-14, Mi-17, Mi-24 and related models
Rotor Configuration: Three-blade variable-pitch tail rotor
Compatible Blades: Tail rotor blades 246-3925-00
Operating Mode: Operation as part of the tail rotor assembly
Manufacturer: Moscow Machine-Building Plant “Vpered”
Condition: As applicable
Technical Documentation: Component logbook, operational documentation, aircraft parts catalog, maintenance documentation

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