246-3925-00

Correct relationship between the blades, hub and complete tail rotor

The component designations in this system must not be mixed. The 246-3925-00 designation refers to the three-blade set. The compatible 246-3914-000 tail rotor hub is a separate assembly. When the hub and blades are supplied as the complete tail rotor, the relevant assembly designation is 246-3904-000 Series 01. This distinction is important for quotations, purchase orders and document review. A request for 246-3925-00 therefore concerns the matched blade set, while a request for 246-3904-000 Series 01 concerns the complete tail rotor assembly.

Passport-confirmed technical data

The reference passport specifies three blades in one set. Each blade has a length of 1,719 mm, measured from the blade butt stops, with a tolerance of +2 mm and −4 mm. The maximum permitted mass of one blade is 14.25 kg. The passport also records the individual masses, static moments and control-section twist values for the serial-numbered blades in that particular set. Those serial-specific figures are acceptance and balancing records for the documented set and are not presented here as universal values for every 246-3925-00 set. This product page therefore uses only the common technical limits confirmed by the passport.

Application and installation control

The passport references installation on the applicable 240 and 80MT product modifications and on 171, AMT, 172 and MTV configurations with the stated engine and control-system arrangements. For the 171, AMT, 172 and MTV configurations, it specifically references TV3-117VM and VK-2500-03 engines with the moving-stop control system. In commercial terms, the part is associated with relevant Mi-8MTV, Mi-17 and Mi-171 family configurations. Final applicability must always be confirmed against the aircraft parts catalogue, installed tail rotor configuration, engine installation, modification status and maintenance documentation. It should not be selected only from a photograph or from a similar-looking blade designation.

Service life, documentation and ordering

The reference passport states an assigned service life of 1,000 operating hours within an assigned calendar life of seven years. It also states an initial storage period of one year in the manufacturer's preservation and packaging, included within the assigned calendar life. These are assigned-life values, not a generic overhaul interval. The passport set-composition section identifies one product passport, designation 246-3925-001PS, and balancing plates 8-3922.09 intended for maintenance use. Actual serial numbers, production year, preservation status, documentation and remaining life must be confirmed for the specific set offered. When requesting a quotation, please state the helicopter modification, installed tail rotor or hub designation, required quantity and documentation requirements.