Aircraft Fuel Pump Test Rig

Aircraft Fuel Pump Test Rig - This test equipment is meant for preliminary regulation of NR-31BT1 Unit.
NR-31BT1 is the fuel pump and controller of the engine. It regulates fuel flow in relation to throttle position,
engine speed, engine inlet air temperature, engine compressor outlet pressure and electrical commands for
engine control. Apart from controlling fuel flow , the NR-31BT1 unit controls the position of compressor
inlet guide vanes in relation to engine speed and engine inlet temperature.
The Test Equipment is sub-divided into following Sub-sections, viz;
i. Hydraulic Circuit - The functions of the fuel system is to:
• Feed the unit with fuel.
• Supply constant pressure lines of 22 Kgf/cm2 & 11 kgf /cm2.
• Maintain drain pressure 2 kgf/cm2.
• Simulation of Guide vane cylinder actuation.
This Circuit can be further divided into:
a) Tank and Filtration Unit: This includes 100 liters Tank (for ATF) and Low Pressure Filtration Unit.
b) Loading Unit - This includes Loading Section, inlet from Pump (rated 50 kgf/cm2, 50 LPM) to Test
Unit (NR-31 Fuel Pump), via, Constant Pressure Valves set at 11 ± 0.2 kgf/cm2 and 22 ± 0.2 kgf/cm2.
c) Test Equipment Driving Unit: This includes Test Equipment driving motor connected to Test unit by Gear box with a gear ratio of 1:4.32.
d) Drain Unit: This unit consists of Dome Regulated Pressure valve which maintains a Pressure of
22 ± 0.2 kgf/cm2 in the drain line.
ii. Pneumatic Circuit - This is further divided as:
a) Low Pressure Line: The low pressure system is meant for supplying air for drying of units by blowing.
High Pressure Line: The high pressure air system is meant for supply of simulation air pressure to TDK-Tp temperature sensor.
iii. Preservation Circuit - Includes Circuit which is used to fill the Test unit with Preservation oil heated to a temperature of 70oC.