350.003V

350.003V in Mi-26 fuel supply systems

The 350.003V filter pack is used in the low-pressure fuel supply lines of the Mi-26 helicopter, where fuel is cleaned before it is delivered further to the engines and auxiliary power unit. Its function is to protect downstream fuel equipment from mechanical contamination that may enter the fuel system during refueling, storage, maintenance or operation. Fuel cleanliness is especially important for injectors, pumps, regulating units and other precision components. If the filter pack is contaminated or damaged, fuel flow may be restricted, and the fuel system can show abnormal pressure drop or unstable operation.

Installation of the 350.003V element inside filter 8D5.886.528-1

The 350.003V is installed inside the aircraft main-line fuel filter identified as 8D5.886.528-1. The metal filter body or cup forms the external assembly, while the 350.003V filter pack is the internal filtering cartridge made for fuel cleaning. This distinction is important when ordering parts. A request for the complete filter assembly and a request for the internal filter pack are not the same. During replacement or maintenance, the filter body, seals, filter pack, seating surfaces and fastening elements should be checked together according to the aircraft maintenance documentation.

Regenerable construction of the 350.003V fuel element

The 350.003V filter pack is a regenerable element. This means it can be cleaned and reused if its condition remains within the limits allowed by maintenance documentation. Regeneration may include washing and ultrasonic cleaning, depending on the approved procedure and available service equipment. This design is practical for aircraft fuel systems because it reduces the need to discard the filtering element after every contamination event. However, reuse is acceptable only if the element is not mechanically damaged, deformed, clogged beyond recovery or affected by corrosion or other defects.

Fuel compatibility and filtering performance of 350.003V

The 350.003V filter pack is used with aviation kerosene grades such as T-1, T-2, TS-1 and RT. Its task is to remove mechanical particles from fuel while maintaining the required flow through the main-line filter. The element must provide stable filtration without creating excessive hydraulic resistance. If contamination builds up, pressure drop across the filter increases and fuel delivery may be affected. For this reason, the filter pack should be inspected, cleaned or replaced according to the maintenance schedule and actual contamination condition.

Identification and ordering of 350.003V

Before ordering 350.003V, it is important to confirm that the requirement is for the internal filter pack and not for the complete 8D5.886.528-1 fuel filter assembly. The aircraft type, fuel system location, installed filter housing and required documentation should be checked. For overhaul or maintenance supply, it may also be necessary to specify whether sealing rings or related consumable parts are needed together with the filter pack. The product may be referenced under the designations 350.003V and 350.003V, depending on Latin or Cyrillic catalog transcription.

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