DTSN-80

Fuel boosting function of the DTSN-80 pump

The main task of the DTSN-80 is to boost fuel and maintain the required pressure conditions in the engine fuel system. The pump creates flow before the fuel reaches fuel-regulating equipment, where precise metering is performed. Stable inlet conditions are important for correct engine acceleration, steady operation and response to load changes. If the DTSN-80 does not provide the required fuel output, downstream fuel-control units may operate incorrectly, especially at high engine speed, during acceleration or when fuel demand changes quickly.

DTSN-80 installation on the engine accessory gearbox

The DTSN-80 is mounted directly on the aircraft engine accessory gearbox. It does not have its own electric motor. The pump shaft is driven mechanically from the engine gearbox through a splined connection, and the body is fixed to the gearbox by a mounting flange. During installation, the drive spline, mounting surface, sealing rings, shaft alignment and flange condition must be checked carefully. Since the pump works as part of the engine mechanical drive system, poor installation can lead to leakage, vibration, abnormal wear or reduced fuel pressure.

Centrifugal fuel pumping principle of DTSN-80

The DTSN-80 uses a centrifugal rotor to move aviation kerosene through the pump. The rotating impeller accelerates the fuel and converts mechanical drive energy into flow and pressure. This design is suitable for continuous engine operation and compact installation on the gearbox. At the same time, the pump depends on clean fuel, correct inlet pressure and a healthy mechanical drive. Contamination, inlet restriction, worn rotor elements, seal damage or poor fuel supply from the aircraft system can reduce pump output and affect engine fuel regulation.

Hydraulic connections of the DTSN-80 pump

The DTSN-80 has an inlet connection and an outlet pressure connection. The inlet receives fuel from the aircraft low-pressure supply line, normally after tank or booster pumps. The outlet sends pressurized fuel to the engine pump-regulator, NR-type units and other hydromechanical control equipment depending on the engine configuration. The joint between the pump and the accessory gearbox is sealed with rubber O-rings. These seals help prevent fuel leakage and protect the gearbox side from incorrect fluid contact.

DTSN-80 and DTSN-80T modification

The DTSN-80 family includes the base DTSN-80 version and the related DTSN-80T modification. The “T” version is usually described as a modified or heat-resistant execution, with different overall dimensions while keeping similar mass. These versions should not be treated as automatically interchangeable. Housing dimensions, mounting layout, operating environment and engine-specific requirements may differ. For procurement or replacement, the exact designation should be checked against the engine parts catalog, fuel system documentation and the pump nameplate.

Application of DTSN-80 on engines and aircraft

The DTSN-80 is associated with engine fuel systems for NK-22, D-18T, RD-33, AL-31F / AL-31FP and related engine installations depending on configuration. Typical aircraft applications include An-124 “Ruslan”, An-225 “Mriya”, MiG-29, Su-27, Su-33, Su-35 and related platforms. The exact installation must always be confirmed by the engine and aircraft documentation, because the same pump family may have different fittings, drive interfaces, operating conditions or modification requirements.

Supply and inspection of DTSN-80

For supply, the pump should be requested by its full designation: DTSN-80 / ДЦН-80, or DTSN-80T / ДЦН-80Т if the modified version is required. Before installation, the unit should be checked for housing condition, flange surfaces, shaft and spline wear, sealing areas, cleanliness of inlet and outlet ports, leakage and pressure performance. Since the pump is part of the engine fuel system, passport, storage records, repair documents or bench-test documentation should be confirmed whenever available.