15-5303-10-3

15-5303-10-3 hydraulic accumulator overview

The 15-5303-10-3 is an aircraft hydraulic accumulator used in onboard hydraulic systems where pressure reserve and stable circuit operation are required. It is not a pump and not a control valve. The unit stores hydraulic energy already present in the system and returns it when pressure drops or when the connected hydraulic line needs short-term support. In aircraft maintenance documentation, this type of unit is normally treated as a pressure storage and reserve element of the hydraulic system.

Pressure storage function of 15-5303-10-3

The main task of the 15-5303-10-3 is to help maintain pressure continuity in the hydraulic circuit. When system pressure changes, the accumulator compensates for short pressure losses and supports the connected line. This is useful in circuits where a sudden pressure drop can affect actuator response, valve operation or mechanically loaded units. The accumulator gives the system a stored pressure buffer and helps reduce the effect of short hydraulic pressure fluctuations.

15-5303-10-3 in reserve hydraulic circuits

The 15-5303-10-3 may be used in hydraulic and reserve circuits where the system must retain limited operating capability after a change in normal pressure supply. In such applications, the accumulator supports emergency or backup logic by keeping a stored volume of pressurized fluid available. It does not replace the hydraulic pump, but it can help the circuit respond when pressure supply is interrupted, delayed or reduced for a short period.

Hydraulic system operation with 15-5303-10-3 installed

The accumulator works as part of a complete hydraulic installation. Around it are pumps, pressure lines, shut-off valves, check valves, filters, fittings and hydraulically driven mechanical units. The accumulator does not control these units directly. Its role is to keep pressure available when supply or demand changes. If system pressure is unstable, maintenance personnel should also check nitrogen charge, leaks, pump output, valve condition, filters, contamination and connected hydraulic components.

Diaphragm and service components for 15-5303-10-3

For repair or overhaul, the 15-5303-10-3 may be associated with several service parts. These include the diaphragm 15.5303.010-006, also referenced as 15-5303-10-6, upper nut 15.5303.012, upper cover 15.5303.048, cover 15.5303.052 and lower nut 15.5303.053. These references are useful when the request concerns not the complete accumulator, but repair components or individual parts from the assembly.

Identification of 15-5303-10-3

The same product may appear in documentation with slightly different writing styles, including 15-5303-10-3 and 15.5303-10-3. Before ordering, the marking on the installed unit should be compared with the aircraft spare parts catalog or manufacturer documentation. A visually similar hydraulic accumulator is not always the correct replacement. The required version should be confirmed by part number, system location, pressure data and repair documentation.

Nitrogen charging and pressure values

The 15-5303-10-3 is a charged hydraulic accumulator with a 2.5 L capacity. The working pressure is listed as P = 6.5 MPa, while the nitrogen charging pressure is listed as E = 10 MPa. These values must be checked against the applicable documentation before servicing, because pressure units and notation in older technical documents can be critical. Charging and maintenance must be performed only according to the approved aircraft or manufacturer procedure.

Supply and documentation for 15-5303-10-3

For procurement, the requirement should clearly state whether the customer needs the complete hydraulic accumulator or separate service parts such as the diaphragm, covers or nuts. The unit may be supplied new, from storage, repaired, overhauled or serviceable depending on availability. For aviation use, manufacturer technical documentation, product passport, test documents, repair records or spare parts catalog reference should be confirmed before delivery.

Product Type: Aircraft hydraulic accumulator
Designation: 15-5303-10-3
Alternative Designation: 15.5303-10-3
Function: Pressure storage, pressure reserve and maintenance of hydraulic pressure
Application / Where Used: Aircraft hydraulic and reserve systems
System / Installation Area: Hydraulic system
Compatible Aircraft / Equipment: Russian-manufactured helicopters equipped with applicable hydraulic systems
Accumulator Capacity: 2.5 L
Working Pressure: P = 6.5 MPa
Nitrogen Charging Pressure: E = 10 MPa
Weight: Approx. 4.0 kg
Working Medium: Aircraft hydraulic fluid according to the applicable system documentation
Related Service Part: Diaphragm 15.5303.010-006 / 15-5303-10-6
Associated Components: Upper nut 15.5303.012; upper cover 15.5303.048; cover 15.5303.052; lower nut 15.5303.053
Interchangeability / Replaceability: Must be confirmed by spare parts catalog, installed-unit marking and repair documentation
Condition: New / from storage / repaired / overhauled / serviceable depending on availability
Inspection / Testing: Body inspection, marking check, leak check, pressure check, nitrogen charge check, diaphragm condition check, fitting and thread inspection
Technical Documentation: Manufacturer technical documentation, product passport, repair documentation and spare parts catalog as applicable

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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.