246-3925-00

Tail rotor blade 246-3925-00

246-3925-00 is a helicopter tail rotor blade designed for installation on Mi-8 family helicopters and related models. The blade works as part of the tail rotor system, where it generates lateral thrust needed to compensate main rotor torque and provide yaw control. It is not used as an independent component; it operates only within the complete tail rotor assembly together with the hub, pitch-change mechanism and other blades. During operation, the blade is exposed to aerodynamic load, centrifugal force, vibration and variable pitch movement, so its condition directly affects tail rotor efficiency and directional control.

Yaw control function of the 246-3925-00 blade

The 246-3925-00 blade produces aerodynamic thrust when the tail rotor rotates. By changing blade pitch through the tail rotor control system, the helicopter can increase or reduce lateral thrust and control yaw movement. This allows the aircraft to counter the torque produced by the main rotor and maintain heading during hover, climb, cruise, descent and maneuvering. Since the blade works under changing pitch angles, it must maintain stable geometry and surface condition across operating modes. Damage, deformation, delamination, imbalance or incorrect installation can affect thrust generation and increase vibration.

246-3925-00 in a three-blade tail rotor assembly

The 246-3925-00 is used as part of a three-blade tail rotor configuration. The blade is installed on the compatible tail rotor hub 246-3901-000 Series 01, which provides blade attachment and transmits control forces for pitch variation. The full tail rotor assembly normally includes three blades installed as a matched rotating set. The hub and blade set must correspond to the aircraft documentation, because the tail rotor is a dynamically loaded and balanced assembly. A blade should not be selected only by visual similarity; the designation, hub compatibility, logbook data and service condition must be checked.

Aircraft application of 246-3925-00 tail rotor blades

The 246-3925-00 tail rotor blade is used on Mi-8 family helicopters and derivative models, including Mi-8MTV-1, Mi-17, Mi-171 and Mi-172. It may also be referenced for other Russian-made helicopters with compatible tail rotor systems, including Ka-32, depending on the aircraft documentation and installed rotor configuration. Since aircraft may differ by modification, production year, service bulletin status and previous repair history, applicability should be confirmed before supply or installation. This is especially important when replacing individual blades or completing a tail rotor set.

Service life control for the 246-3925-00 blade

The 246-3925-00 blade is a life-controlled component. Its remaining serviceability depends on production year, operating time, calendar life, overhaul history and recorded condition. These data are normally tracked through the individual component logbook. When the blade is supplied in new condition or as serviceable used stock, the documentation status should be checked before acceptance. For operational use, the logbook and accompanying documents are as important as the physical condition of the blade, because resource limits and overhaul intervals determine whether the blade can be installed.

Identification and ordering of 246-3925-00

Before ordering 246-3925-00, it is useful to specify the helicopter type, tail rotor hub, required condition, documentation availability and whether the requirement is for one blade or for a complete set. If the blade is needed for a matched tail rotor assembly, blade set composition and logbook records should be clarified separately. The designation should be checked against the aircraft parts catalog and the installed hub 246-3901-000 Series 01. For export, overhaul or operational supply, photos of markings and document pages can help confirm the correct version and remaining service life.

Product Type: Tail rotor blade
Designation: 246-3925-00
Alternative Designations: 246392500, 246-3925-000
Function: Generation of lateral thrust for main rotor torque compensation and helicopter yaw control
Application / Where Used: Helicopter tail rotor systems
System / Installation Area: Tail rotor assembly, tail boom
Compatible Aircraft / Equipment: Mi-8MTV-1, Mi-17, Mi-171, Mi-172, Ka-32 helicopters and related configurations according to aircraft documentation
Rotor Configuration: Three-blade tail rotor
Compatible Hub: Tail rotor hub 246-3901-000 Series 01
Operating Mode: Operation as part of the complete tail rotor assembly
Blade Length: 1719 mm +2 / −4 mm from joint hole axis
Weight: Not more than 14.25 kg
Time Between Overhaul: Up to 1000 flight hours
Calendar TBO: Up to 7 years
Condition: New or serviceable used, depending on availability
Documentation: Component logbook and accompanying documentation, if available

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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.