8A-5301-370-001

8A-5301-370-001 hydraulic accumulator for Mi-8 systems

The 8A-5301-370-001 is an aircraft hydraulic accumulator used on Mi-8 series helicopters. It is installed in onboard systems where the working fluid must keep a stable pressure reserve during normal operation. The unit does not create pressure by itself. It stores part of the hydraulic energy already present in the system and returns it when the line pressure drops or starts to fluctuate. In maintenance documentation, this type of accumulator is treated as a pressure support element within the helicopter hydraulic system.

Pressure stabilization role of 8A-5301-370-001

In operation, the accumulator helps smooth pressure changes in the working fluid. This is useful when pumps, valves, or actuators create short pressure pulses in the line. Without a pressure buffer, these changes can affect the response of connected units and increase load on the hydraulic circuit. The 8A-5301-370-001 works as a reserve volume for the system and supports more stable operation of hydraulic equipment. It can also be used in circuits connected with fuel and oil system components, where the design requires pressure compensation.

Mi-8 hydraulic system with accumulator 8A-5301-370-001

On Mi-8 helicopters, the accumulator works as part of a larger onboard system. Around it are hydraulic pumps, pipelines, valves, fittings, filters, actuators, and control units. The accumulator does not command these components. Its job is to support the pressure condition of the circuit, reduce sudden drops, and help the system keep reserve capacity. The exact location and connection should be checked by the Mi-8 maintenance documentation or spare parts catalog, because helicopter configuration may differ by modification, overhaul history, and installed equipment set.

Installation and system checks for 8A-5301-370-001

Before replacement, the installed accumulator should be checked by part number, pressure requirement, and system location. A unit with a similar appearance is not always a correct replacement, especially on helicopters that have passed through repair or modification. The hydraulic system must also be checked for related issues, because unstable pressure may come from pumps, leaks, valve condition, contamination, or incorrect charging of the accumulator. For supply, it is better to confirm the full designation from the aircraft documentation rather than rely only on the general Mi-8 application.

Identification and ordering of 8A-5301-370-001

The product may appear in documents under more than one writing style. In English and export requests, the usual designation is 8A-5301-370-001. In Russian documentation, the same item may be written as 8А-5301-370-001. An alternative variant, 8A-5301-370-002, may also be listed in documentation, but interchangeability should be confirmed by the aircraft parts catalog before ordering. The product is also known under alternative designations 8A-5301-370-001 and 8А-5301-370-001.

Product Type: Hydraulic accumulator
Function: Pressure storage and stabilization of working fluid
Application / Where Used: Aircraft hydraulic, fuel, and oil systems
System / Installation Area: Hydraulic system
Compatible Aircraft / Equipment: Mi-8 helicopter family
Operating Pressure: Not less than 28 kg/cm²
Interchangeability / Replaceability: Alternative variant 8A-5301-370-002
Technical Documentation: Mi-8 maintenance documentation / spare parts catalog

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