Fuel Pump-Regulator
NR-53D
Price on request
Fuel Pump-Regulator
Out of stock
Description
NR-53D in aircraft engine fuel control systems
The NR-53D is an aircraft fuel pump-regulator used for automatic fuel supply and control of gas turbine engine operating modes. The unit combines a high-pressure pumping section with a hydromechanical automatic regulator. It meters fuel to the engine according to operating conditions and supports stable engine operation during start, idle, acceleration and high-power modes. In the fuel system, the NR-53D is not only a pump, but also a regulating unit that controls several important engine parameters.
Fuel supply function of the NR-53D pump-regulator
The main task of the NR-53D is to supply aviation kerosene under pressure to the engine combustion chamber through the fuel system. The pump section creates fuel pressure, while the regulating part doses the required fuel flow. This is especially important during engine acceleration and load changes, when the engine must receive enough fuel without surge, overtemperature or unstable rotor speed. Correct operation of the NR-53D directly affects engine start quality, throttle response and steady operation at selected modes.
Automatic speed control by the NR-53D
The NR-53D includes an all-mode centrifugal speed controller. This unit automatically stabilizes the selected rotor speed and adjusts fuel delivery according to engine demand. It helps maintain the required number of revolutions at different power settings and flight conditions. The pump-regulator also includes physical speed sensing elements and correction devices that allow the unit to respond to changes in air temperature, compressor pressure and engine operating mode. This makes the NR-53D a key part of the hydromechanical fuel-control system.
Acceleration and starting control in the NR-53D
During engine start, the NR-53D provides a carefully metered fuel supply to support ignition and spool-up without excessive fuel delivery. During acceleration, it follows a programmed fuel schedule so that fuel flow increases in a controlled way. This prevents unstable combustion and protects the engine from exceeding operating limits. The built-in launcher and acceleration control functions are especially important for older hydromechanical engine-control systems, where fuel flow is regulated mechanically and hydraulically rather than by a fully digital control unit.
Guide vane and compressor protection functions of NR-53D
The NR-53D is equipped with systems related to compressor and engine operating limits. It includes a guide vane regulator, a maximum reduced speed limiter and an air pressure limiter behind the compressor. These functions help coordinate fuel delivery with airflow and compressor operating conditions. The unit also includes an idle speed corrector, which adjusts low-idle settings according to outside air temperature. Together, these functions help maintain stable engine operation and protect the engine from dangerous regimes.
Main units included in the NR-53D
The NR-53D consists of several functional sections: the pumping unit, all-mode centrifugal speed controller, physical speed sensor, temperature sensor, pick-up mechanism, guide vane regulator, maximum reduced speed limiter, compressor discharge pressure limiter, idle speed corrector and starting device. These sections work together as one hydromechanical control assembly. Because the unit is complex, replacement or repair should be handled using proper engine documentation and test procedures rather than by visual inspection alone.
Operating conditions of the NR-53D
The NR-53D works with aviation fuel and is designed for demanding aircraft engine conditions. The fuel temperature at the pump inlet may range from −50 to +100 °C, while the ambient temperature range for the unit is specified from −60 to +220 °C. The unit operates at high pump speed and fuel pressure, so clean fuel, correct inlet pressure and proper filtration are essential. Low inlet pressure, contamination, air in the fuel line or incorrect adjustment can lead to unstable engine control.
Supply, repair and inspection of NR-53D
The NR-53D belongs to aviation technical equipment and is normally supplied as new production, first-category storage stock, repaired, overhauled or serviceable tested stock depending on availability. For installation on an aircraft engine, the unit should have a passport, preservation / storage records, repair documents or bench-test documentation whenever available. During inspection, attention should be paid to the drive interface, housing condition, fittings, seals, fuel ports, adjustment points, corrosion, leakage traces and correct operation on a test bench.
Details
Product Type: Aircraft fuel pump-regulator
Designation: NR-53D
Alternative Designation: НР-53Д
Function: Fuel pumping, metering and automatic regulation of aircraft gas turbine engine operating parameters
Application / Where Used: Fuel-control systems of aircraft gas turbine engines
System / Installation Area: Engine-mounted fuel supply and hydromechanical control system
Operating Role: High-pressure fuel pump and automatic hydromechanical regulator
Working Medium: Aviation fuel / kerosene
Main Units: Pumping unit, all-mode centrifugal speed controller, physical speed sensor, temperature sensor, pick-up mechanism, guide vane regulator, maximum reduced speed limiter, compressor discharge pressure limiter, idle speed corrector and launcher
Direction of Pump Drive Rotation: Right-hand, according to GOST 1630-46
Gear Ratio: 2.026
Maximum Pumping Unit Speed: 4250 rpm
Permissible Pumping Unit Overspeed: Up to 4400 rpm
Inlet Pressure to Pumping Unit: 1.8–7.0 kgf/cm²; at idle not less than 1.2 kgf/cm²
Maximum Productivity: Not less than 11,000 kg/h at 4150 rpm
Maximum Fuel Pressure After Pump: 80 kgf/cm²
Fuel Temperature at Pump Inlet: −50 to +100 °C
Ambient Temperature Range: −60 to +220 °C
Speed Controller Type: All-mode centrifugal controller
Control / Regulation Functions: Fuel metering, engine speed stabilization, acceleration fuel schedule, guide vane regulation, maximum reduced speed limitation, compressor pressure limitation, starting fuel control and idle speed correction
Supply Category: New production, first-category storage stock, repaired / overhauled or tested serviceable unit depending on availability
Technical Documentation: Product passport, repair documents, bench-test documents and engine fuel-control system documentation as applicable
Payment & delivery
All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.
In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.
Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.
Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.
Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.
Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.
- Description
- Details
- Payment & delivery
NR-53D in aircraft engine fuel control systems
The NR-53D is an aircraft fuel pump-regulator used for automatic fuel supply and control of gas turbine engine operating modes. The unit combines a high-pressure pumping section with a hydromechanical automatic regulator. It meters fuel to the engine according to operating conditions and supports stable engine operation during start, idle, acceleration and high-power modes. In the fuel system, the NR-53D is not only a pump, but also a regulating unit that controls several important engine parameters.
Fuel supply function of the NR-53D pump-regulator
The main task of the NR-53D is to supply aviation kerosene under pressure to the engine combustion chamber through the fuel system. The pump section creates fuel pressure, while the regulating part doses the required fuel flow. This is especially important during engine acceleration and load changes, when the engine must receive enough fuel without surge, overtemperature or unstable rotor speed. Correct operation of the NR-53D directly affects engine start quality, throttle response and steady operation at selected modes.
Automatic speed control by the NR-53D
The NR-53D includes an all-mode centrifugal speed controller. This unit automatically stabilizes the selected rotor speed and adjusts fuel delivery according to engine demand. It helps maintain the required number of revolutions at different power settings and flight conditions. The pump-regulator also includes physical speed sensing elements and correction devices that allow the unit to respond to changes in air temperature, compressor pressure and engine operating mode. This makes the NR-53D a key part of the hydromechanical fuel-control system.
Acceleration and starting control in the NR-53D
During engine start, the NR-53D provides a carefully metered fuel supply to support ignition and spool-up without excessive fuel delivery. During acceleration, it follows a programmed fuel schedule so that fuel flow increases in a controlled way. This prevents unstable combustion and protects the engine from exceeding operating limits. The built-in launcher and acceleration control functions are especially important for older hydromechanical engine-control systems, where fuel flow is regulated mechanically and hydraulically rather than by a fully digital control unit.
Guide vane and compressor protection functions of NR-53D
The NR-53D is equipped with systems related to compressor and engine operating limits. It includes a guide vane regulator, a maximum reduced speed limiter and an air pressure limiter behind the compressor. These functions help coordinate fuel delivery with airflow and compressor operating conditions. The unit also includes an idle speed corrector, which adjusts low-idle settings according to outside air temperature. Together, these functions help maintain stable engine operation and protect the engine from dangerous regimes.
Main units included in the NR-53D
The NR-53D consists of several functional sections: the pumping unit, all-mode centrifugal speed controller, physical speed sensor, temperature sensor, pick-up mechanism, guide vane regulator, maximum reduced speed limiter, compressor discharge pressure limiter, idle speed corrector and starting device. These sections work together as one hydromechanical control assembly. Because the unit is complex, replacement or repair should be handled using proper engine documentation and test procedures rather than by visual inspection alone.
Operating conditions of the NR-53D
The NR-53D works with aviation fuel and is designed for demanding aircraft engine conditions. The fuel temperature at the pump inlet may range from −50 to +100 °C, while the ambient temperature range for the unit is specified from −60 to +220 °C. The unit operates at high pump speed and fuel pressure, so clean fuel, correct inlet pressure and proper filtration are essential. Low inlet pressure, contamination, air in the fuel line or incorrect adjustment can lead to unstable engine control.
Supply, repair and inspection of NR-53D
The NR-53D belongs to aviation technical equipment and is normally supplied as new production, first-category storage stock, repaired, overhauled or serviceable tested stock depending on availability. For installation on an aircraft engine, the unit should have a passport, preservation / storage records, repair documents or bench-test documentation whenever available. During inspection, attention should be paid to the drive interface, housing condition, fittings, seals, fuel ports, adjustment points, corrosion, leakage traces and correct operation on a test bench.
Product Type: Aircraft fuel pump-regulator
Designation: NR-53D
Alternative Designation: НР-53Д
Function: Fuel pumping, metering and automatic regulation of aircraft gas turbine engine operating parameters
Application / Where Used: Fuel-control systems of aircraft gas turbine engines
System / Installation Area: Engine-mounted fuel supply and hydromechanical control system
Operating Role: High-pressure fuel pump and automatic hydromechanical regulator
Working Medium: Aviation fuel / kerosene
Main Units: Pumping unit, all-mode centrifugal speed controller, physical speed sensor, temperature sensor, pick-up mechanism, guide vane regulator, maximum reduced speed limiter, compressor discharge pressure limiter, idle speed corrector and launcher
Direction of Pump Drive Rotation: Right-hand, according to GOST 1630-46
Gear Ratio: 2.026
Maximum Pumping Unit Speed: 4250 rpm
Permissible Pumping Unit Overspeed: Up to 4400 rpm
Inlet Pressure to Pumping Unit: 1.8–7.0 kgf/cm²; at idle not less than 1.2 kgf/cm²
Maximum Productivity: Not less than 11,000 kg/h at 4150 rpm
Maximum Fuel Pressure After Pump: 80 kgf/cm²
Fuel Temperature at Pump Inlet: −50 to +100 °C
Ambient Temperature Range: −60 to +220 °C
Speed Controller Type: All-mode centrifugal controller
Control / Regulation Functions: Fuel metering, engine speed stabilization, acceleration fuel schedule, guide vane regulation, maximum reduced speed limitation, compressor pressure limitation, starting fuel control and idle speed correction
Supply Category: New production, first-category storage stock, repaired / overhauled or tested serviceable unit depending on availability
Technical Documentation: Product passport, repair documents, bench-test documents and engine fuel-control system documentation as applicable
All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.
In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.
Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.
Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.
Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.
Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.