GTN7-3

GTN7-3 in aircraft fuel supply systems

The GTN7-3 is an aircraft fuel hydraulic pump used in onboard fuel systems for transferring aviation fuel and supporting stable fuel supply to engine-related fuel equipment. The pump works as part of the fuel feed architecture, where fuel must be moved from supply tanks toward engine-driven centrifugal pumps or downstream fuel units. Its role is practical and system-critical: it helps keep the fuel line supplied and reduces the risk of pressure loss at the inlet of the next pump stage.

Fuel transfer function of the GTN7-3 pump

The main task of the GTN7-3 is to transfer aviation fuel through the supply line and maintain the required pressure differential in the system. In operation, the pump supports a wide flow range, which allows it to work under different engine and system demand conditions. The pump is not simply a passive line component. It actively helps the fuel system keep enough flow and inlet pressure for stable engine feed, especially when fuel demand changes or when system resistance varies.

GTN7-3 as a hydraulic-drive fuel pump

The GTN7-3 is classified as a fuel hydraulic pump with hydraulic drive. This means its operation is integrated into the aircraft fuel system architecture and depends on the drive and hydraulic conditions provided by the system. Correct performance is affected not only by the pump itself, but also by inlet conditions, fuel cleanliness, connected lines, downstream pump condition, valves, filters and pressure losses in the fuel path. During troubleshooting, these related elements should be checked together with the pump.

GTN7-3 in the fuel feed line

The GTN7-3 is installed in the fuel supply line, where it supports fuel transfer from tanks to engine-driven centrifugal pumps. In this position, it helps maintain continuous fuel delivery and prevents unstable feed at the next pump stage. If the unit does not provide the required flow or pressure differential, the symptoms may appear as poor fuel feed, pressure instability, delayed engine response or abnormal system indication. The exact behavior depends on the aircraft fuel system design and the operating mode.

Aircraft application of the GTN7-3

The GTN7-3 is used in aircraft fuel systems across different civil and military aviation platforms, depending on the installed fuel equipment and system configuration. Since fuel system architecture differs significantly between aircraft types, the exact applicability of the pump should be confirmed by the aircraft parts catalog, fuel system diagram and maintenance documentation. The same pump designation may be used in several installations, but fittings, line position and associated units may vary.

Identification and alternative names of GTN7-3

The pump may be referenced as GTN7-3, GTN-7-3 or ГТН7-3 in technical requests and procurement documents. For supply, it is better to use the exact designation from the aircraft documentation or the unit nameplate. Small differences in spelling can matter when searching stock, repair documents or certificates. If the pump is required for a specific aircraft, the request should include the aircraft type, system position, required condition and documentation requirements.

Supply and inspection of GTN7-3

For procurement or replacement, the GTN7-3 should be checked for condition, markings, inlet and outlet condition, signs of corrosion, contamination, mechanical damage and compatibility with the target fuel system. Since it is a fuel-system pump, cleanliness and sealing are important. The unit may be supplied new, from storage, repaired, overhauled or tested serviceable depending on availability. For aviation use, product documentation, quality documents or bench-test records should be confirmed before installation.

Technical Details

Product Type: Aircraft fuel hydraulic pump
Designation: GTN7-3
Alternative Designations: GTN-7-3, ГТН7-3
Function: Fuel transfer and pressure support in aircraft fuel systems
Application / Where Used: Aircraft fuel systems
System / Installation Area: Fuel supply line
Operating Role: Transfer of fuel from supply tanks to engine-driven centrifugal pumps
Working Medium: Aviation fuel
Drive Type: Hydraulic
Flow Rate: 15,000 to 80,000 L/h
Pressure Differential: 0.45 to 0.75 kgf/cm²
Weight: 2.1 kg
Compatible Aircraft / Equipment: Civil and military aircraft depending on fuel system configuration
Associated Equipment: Supply tanks, fuel lines, engine-driven centrifugal pumps, valves and filters depending on aircraft system
Condition: As applicable
Technical Documentation: Product documentation, quality documents and aircraft fuel system maintenance documentation as applicable

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