DTSN-78

DTSN-78 in the aircraft engine fuel system

The DTSN-78 is an engine-driven centrifugal pump used in aircraft fuel and fuel-regulation systems. Its main task is to supply aviation fuel under pressure and maintain the required flow conditions in the engine fuel line. In the fuel system chain, the pump works as a booster / first-stage unit before more precise fuel-control equipment. It helps provide stable fuel feed to the connected regulator, filters, heat exchanger and other hydraulic fuel-system components.

Fuel supply function of the DTSN-78 pump

The DTSN-78 moves fuel from the engine fuel inlet section toward downstream fuel-system units. The rotating impeller accelerates the fuel, increases its kinetic energy and forms the required pressure at the outlet. This pressure is needed so that the next components in the system receive fuel without starvation, pressure drop or cavitation. In practical engine operation, this is especially important at high rotational speeds and changing fuel demand, when the main fuel pump-regulator must receive stable inlet conditions.

Installation of DTSN-78 on the engine accessory gearbox

The DTSN-78 is installed on the aircraft engine accessory gearbox or drive gearbox. It is not an independent electrically driven pump. The pump is mechanically driven by the engine through the gearbox and shaft connection. Depending on engine design, the DTSN-78 may be mounted as a separate accessory unit or integrated closely with the fuel-control assembly. During replacement or inspection, the mounting flange, drive interface, sealing surfaces, shaft condition and correct installation position must be checked carefully.

Centrifugal operating principle of DTSN-78

The DTSN-78 operates on the centrifugal principle. Fuel enters the pump, is captured by the rotating impeller blades and is accelerated outward by centrifugal force. This converts mechanical drive energy into fuel flow and pressure. The pump is compact, but it is designed for high flow and continuous operation in the engine fuel system. Clean fuel, correct inlet pressure and proper mechanical drive condition are essential. Wear, contamination or inlet restrictions can reduce output pressure and affect the work of connected fuel-control units.

DTSN-78 as a first-stage pump before fuel regulation

In the engine fuel system, the DTSN-78 can serve as the first booster stage before the main fuel pump-regulator. It supplies fuel to the inlet of the main high-pressure plunger pump and helps prevent cavitation under high-speed operation. The pump may also support fuel flow through fine filters, fuel-oil heat exchangers and hydraulic control circuits. Because of this role, a DTSN-78 fault may appear not only as a pump issue, but also as unstable fuel regulation, pressure drop or abnormal behavior of downstream control units.

Interaction of DTSN-78 with connected engine units

The DTSN-78 works together with several fuel-system and engine-control components. It may supply fuel to NR-series pump-regulators, move fuel through a fuel-oil heat exchanger, push fuel through filtration blocks and support hydraulic pressure for control devices such as acceleration and metering automatics. Depending on engine configuration, it may also be associated with fuel de-aeration or centrifugal breather functions. The exact connection scheme must always be checked against the engine fuel-system documentation.

Integral versions and system configuration of DTSN-78

One of the important features of the DTSN-78 family is the possibility of integral modification for a specific engine fuel system. This means the pump may be adapted for installation inside, next to or as part of a larger fuel-regulating assembly. For this reason, the designation alone may not be enough for procurement. The target engine type, installation version, flange arrangement and technical documentation should be confirmed before replacement. Similar DTSN-series pumps may differ significantly by pressure, flow rate, drive and installation.

Supply and documentation for DTSN-78

For supply, the pump should be requested by its full designation: DTSN-78 / ДЦН-78. Since it is part of an aircraft engine fuel system, condition and documentation are important. A unit supplied from storage or after repair should be checked by passport, acceptance records and, where available, bench-test data. Before installation, the pump should be inspected for housing condition, drive interface, sealing surfaces, flow path cleanliness, pressure performance and compatibility with the engine fuel-system layout.

Product Type: Engine-driven centrifugal fuel pump
Designation: DTSN-78
Alternative Designations: ДЦН-78; DTSN-78
Function: Fuel supply under pressure and stabilization of fuel pressure in engine fuel-system lines
Application / Where Used: Aircraft engine fuel and fuel-regulation systems
System / Installation Area: Aircraft engine accessory gearbox / drive gearbox area
Part of System / Included in Set: First-stage / booster section of engine fuel supply and regulation system
Compatible Aircraft / Equipment: Aviation turbojet or turboprop engines depending on fuel-system configuration
Associated Fuel-Control Equipment: NR-series fuel pump-regulators and related fuel-regulation units depending on engine configuration
Associated Units: Fuel-oil heat exchanger, fuel filter block, de-aeration / centrifugal breather elements, acceleration and metering automatics depending on system layout
Pump Type: Centrifugal rotary fuel pump
Drive Type: Mechanical drive from engine accessory gearbox
Own Electric Motor: Not installed
Working Medium: Aviation fuel / kerosene
Flow Rate: 50,000 L/h
Shaft Rotational Speed: 7600 rpm
Inlet Pressure: 0.5–3.3 kgf/cm²
Excess / Boost Pressure: 6.6 kgf/cm²
General Pressure Range Reference: 1.8–20.5 kgf/cm² for related DTSN-series systems depending on mode and configuration
Construction Feature: Centrifugal impeller; possible integral modification for specific engine fuel-system installation
Installation Feature: Mounted on or integrated with aircraft engine accessory / drive gearbox and fuel-regulating units
Overall Dimensions: 144 × 186 × 168 mm
Weight: 2.7 kg
Inspection / Testing: Flow rate check, inlet pressure check, outlet / boost pressure check, drive interface inspection, leakage check, housing and sealing inspection

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