DTSN-44S-P3T

DTSN-44S-P3T in the D-30KU / D-30KP engine fuel system

The DTSN-44S-P3T is an engine-mounted low-pressure centrifugal fuel pump used in the fuel system of D-30KU and D-30KP family aircraft engines. In the marking, the character “3” is used, not the Cyrillic letter “З”. The pump works as the first-stage fuel supply unit before the main high-pressure fuel pump-regulator NR-30KU-4. Its role is to receive aviation kerosene from the aircraft fuel system and provide stable inlet conditions for the downstream fuel-control equipment.

Fuel boosting function of the DTSN-44S-P3T pump

The main task of the DTSN-44S-P3T is to raise fuel pressure before the fuel enters the NR-30KU-4 pump-regulator. This preliminary boosting is necessary to reduce the risk of cavitation at the inlet of the high-pressure plunger pumping section. If inlet pressure is too low, vapor bubbles or air separation may occur in the fuel line, which can disturb fuel metering and affect engine operation. The DTSN-44S-P3T therefore supports stable and reliable work of the whole fuel-control chain.

Centrifugal operating principle of DTSN-44S-P3T

The DTSN-44S-P3T uses a centrifugal rotor to move fuel. Aviation kerosene enters the pump, is captured by the rotating impeller and is forced toward the discharge side by centrifugal force. This design is suitable for low-pressure fuel boosting, where continuous flow and stable inlet pressure for the next fuel-control unit are required. The pump is not the final high-pressure metering unit; it prepares the fuel flow for the main pump-regulator and protects the high-pressure section from poor suction conditions.

DTSN-44S-P3T connection with NR-30KU-4

In the D-30KU / D-30KP engine fuel system, the DTSN-44S-P3T works together with the NR-30KU-4 fuel pump-regulator. The DTSN-44S-P3T supplies fuel at low pressure, while the NR-30KU-4 performs high-pressure pumping, metering and automatic fuel regulation. Between these units, the system may include filtration and air separation equipment, including the TsVS-30K centrifugal air separator with filter-signalizer. This arrangement helps deliver clean and stable fuel to the precision plunger and regulating sections.

Installation of DTSN-44S-P3T on the engine accessory gearbox

The DTSN-44S-P3T is installed on the aircraft engine accessory gearbox of D-30KU / D-30KP engines. It is mounted close to the TsVS-30K air separator and connected with the NR-30KU-4 through rigid external fuel lines in the low-pressure fuel circuit. During installation, the drive interface, mounting flange, sealing surfaces, pipe connections and cleanliness of the ports must be checked carefully. Any leakage, air ingress or restriction in this section can affect the inlet conditions of the main fuel pump-regulator.

DTSN-44S-P3T in Il-62M and Il-76 engine installations

The DTSN-44S-P3T is associated with D-30KU and D-30KP engine fuel systems used on Il-62M and Il-76 aircraft depending on engine configuration. On these engines, it forms part of the engine-mounted fuel equipment group together with the NR-30KU-4, TsVS-30K and related fuel-control elements. The exact installation and connection layout must be verified by the engine fuel system documentation, because pipe routing, fittings and gearbox-mounted equipment can differ by engine version.

Working fuel and operating requirements for DTSN-44S-P3T

The pump works with aviation kerosene used in D-30KU / D-30KP engine fuel systems. Since the DTSN-44S-P3T feeds precision downstream equipment, fuel cleanliness and proper suction conditions are important. Contaminated fuel, clogged filters, air in the line, loose fittings or insufficient inlet pressure may cause unstable supply to the pump-regulator. Before troubleshooting the NR-30KU-4, the low-pressure section with the DTSN-44S-P3T should also be checked, because feed problems may look like faults in the main regulator.

Supply and inspection of DTSN-44S-P3T

For procurement or replacement, the full designation should be used: DTSN-44S-P3T / ДЦН-44С-П3Т. The pump may be supplied new, from storage, repaired, overhauled or tested serviceable depending on availability. Before installation, the unit should be inspected for housing condition, shaft and drive interface, flange surfaces, fuel pipe fittings, seals, leakage traces, corrosion, preservation condition and cleanliness of internal channels. For engine use, pressure, flow and leakage checks should be confirmed by passport, repair or bench-test documentation where available.

Product Type: Engine-mounted low-pressure centrifugal fuel pump
Designation: DTSN-44S-P3T
Alternative Designation: ДЦН-44С-П3Т
Important Marking Note: The designation uses the digit “3” in “П3Т”, not the Cyrillic letter “З”
Function: Preliminary fuel boosting before the main fuel pump-regulator
Application / Where Used: Fuel systems of D-30KU / D-30KP family aircraft engines
System / Installation Area: Engine fuel low-pressure supply section; engine accessory gearbox
Operating Role: First-stage fuel pump before NR-30KU-4
Pump Type: Centrifugal low-pressure fuel pump
Working Medium: Aviation kerosene / aircraft fuel
Associated Main Pump-Regulator: NR-30KU-4
Associated Air Separator / Filter Unit: TsVS-30K centrifugal air separator with filter-signalizer
Compatible Engines: D-30KU, D-30KP and related D-30KU / KP series engines depending on modification
Compatible Aircraft / Equipment: Il-62M, Il-76 and related platforms depending on engine installation
Flow Rate: 2,500 L/h
Nominal Shaft Speed: 8,900 rpm
Inlet Pressure: 0.3 kgf/cm²
Outlet Excess Pressure: 2.1–3.0 kgf/cm²
Dry Weight: 5.6 kg
Overall Dimensions: 259 × 303 mm
Installation: Mounted on the engine accessory gearbox near TsVS-30K; connected to NR-30KU-4 by rigid external low-pressure fuel lines
Inspection / Testing: Leakage check, pressure and flow check, flange and seal inspection, fuel port cleanliness check, housing and drive interface inspection
Technical Documentation: Product passport, repair documents, bench-test documents and D-30KU / D-30KP fuel system documentation as applicable

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