Center Tank Fuel Scavenge Jet Pump
With the main tank fuel pump No. 1 FWD Switch ON, the center tank fuel scavenge jet
pump operates automatically to transfer any remaining center tank fuel to main tank No. 1.
Fuel transfer begins when main tank No. 1 quantity is about one-half. Once the fuel
scavenge process begins, it continues for the remainder of the flight.
Fuel Temperature
The FUEL TEMP indicator located on the fuel control panel displays fuel temperature. A
sensor in main tank No. 1 allows monitoring of fuel temperature. The temperature indicating
system uses AC electrical power.
APU Fuel Feed
When AC fuel pumps are operating, fuel for the APU is supplied from the left side of the fuel
manifold. If the AC fuel pumps are not operating, fuel is suction fed from main tank No. 1.
Option - APU DC Fuel Pump
A DC operated APU fuel boost pump is installed to ensure positive fuel pressure to the APU
fuel control unit. During APU start and operation, the pump operates automatically when the
APU fuel control unit senses low fuel pressure. The pump shuts off automatically when an
AC fuel pump pressurizes the fuel manifold.
