DTSN-82

Fuel boosting function of the DTSN-82 pump

The DTSN-82 provides preliminary fuel pressure before the fuel reaches the main pump-regulator. This first pressure stage is important because the downstream regulator must receive fuel without starvation, cavitation or unstable inlet conditions. The pump creates continuous fuel flow using the centrifugal force of its rotating impeller. In normal operation, the DTSN-82 helps keep the fuel supply stable across engine operating modes, especially where fuel demand changes quickly or the engine operates at high power settings.

Installation of DTSN-82 on the engine accessory gearbox

The DTSN-82 is installed on the engine accessory gearbox / engine unit gearbox of the main aircraft engine. It is not an electrically driven pump and does not have its own motor. The rotor is driven mechanically from the engine shaft through a gear train and drive connection. Because of this, inspection of the pump must include the drive interface, shaft condition, mounting flange, sealing surfaces and gearbox connection. Any problem in the drive or mounting area can affect pump output and fuel-system reliability.

Centrifugal operating principle of DTSN-82

The DTSN-82 operates as a centrifugal rotary pump. Fuel enters the pump, is captured by the impeller blades and is accelerated inside the pump casing. The rotating impeller converts mechanical energy from the engine drive into fuel flow and pressure. This design allows the pump to handle high flow rates while remaining compact enough for engine-mounted installation. Clean fuel, correct inlet pressure and proper drive speed are essential for correct operation. Contamination, inlet restriction or wear can reduce pressure and affect the connected fuel-control system.

DTSN-82 and connected fuel-control equipment

In the engine fuel system, the DTSN-82 supplies fuel through the fine fuel filter toward the NR-31V high-pressure pump-regulator. The NR-31V then meters fuel and distributes it to the main and afterburner combustion circuits, depending on engine configuration. This makes the DTSN-82 an important upstream unit in the fuel-control chain. A fault in the DTSN-82 can appear later as unstable regulator operation, pressure drop, reduced fuel delivery or abnormal behavior of the main and afterburner fuel circuits.

Fuel pressure and high-flow performance of DTSN-82

The DTSN-82 is designed for high fuel delivery. According to the supplied data, the pump flow rate is 81,000 L/h, with shaft speed around 8,000 rpm. The inlet pressure range is 0.45–3.5 kgf/cm², and the excess pressure range is 6.8–8.3 kgf/cm². These values indicate that the pump is intended for a powerful engine fuel system where large fuel flow and stable pressure are required. For installation or acceptance, these parameters should be checked against the engine documentation and test procedure.

System configuration and DTSN-82 versions

DTSN-series pumps may exist in single-circuit, dual-circuit or integral configurations depending on the engine fuel system. The DTSN-82 should therefore be selected not only by designation, but also by engine application and installation configuration. Similar centrifugal engine pumps may differ by flow rate, pressure, mounting, drive interface or regulator compatibility. Before replacement, the pump must be checked against the engine parts catalog, fuel-system diagram and approved interchangeability data.

Supply and documentation for DTSN-82

For supply, the pump should be requested by its full designation: DTSN-82 / ДЦН-82. Since it is part of the aircraft engine fuel system, documentation and testing are important. Units supplied from storage or after repair should be checked by passport, acceptance records and available bench-test data. Before installation, maintenance personnel should inspect the housing, drive connection, flange, sealing areas, hydraulic ports, cleanliness of the flow path, leakage and pressure performance.