FUEL Flashcards
How is fueling accomplished?
The aircraft is fueled at the single-point pressure fueling station located on the right wing.
The fueling station allows for automatic and manual control of the fueling shutoff valves.
What does an IMBAL alert on the Fuel Quantity Indicator indicate?
IMBAL is displayed when main tank fuel quantities differ by greater than 1000 lbs for greater than 60 seconds.
What does the LOW alert on the Fuel Quantity Indicator indicate?
LOW displays when either main tank has less than 2000 lbs for 30 seconds.
What does a CONFIG alert on the Fuel Quantity Indicator indicate?
The CONFIG alert shows when there is 1600 lbs or more in the center tank with both center tank boost pumps OFF and an engine is running.
What does INSUFFICIENT FUEL on the Fuel Quantity Indicator indicate?
INSUFFICIENT FUEL is displayed when the FMC fuel at the destination is predicted to be less than 2000 lbs.
With all fuel pumps operating, what ensures center tank fuel is used before main tank fuel?
Higher fuel pump output pressure from the center tank pumps ensures that center tank fuel is used first.
When do the center tank fuel pumps shut off automatically?
Approximately 15 seconds of a continuous LOW PRESSURE light.
How is fuel provided to the engine(s) without the fuel pumps?
Each engine can draw fuel from its respective main tank through a suction feed line that bypasses the pumps. The center tank does not have the ability to suction feed.
When does the center tank fuel scavenge jet pump activate?
With Main tank No. 1 FWD FUEL PUMPS switch ON and No. 1 fuel quantity decreases to 4500 lbs or less, a float valve to the scavenge jet pump opens. The scavenge process continues for the remainder of the flight, transferring 220–450 lbs per hour.
What is the purpose of the crossfeed valve?
Enables crossfeeding from any of the fuel tanks to either engine.
What does the engine start lever control?
The position of the ENGINE and SPAR fuel shutoff valves is controlled by the start levers.
What does a bright blue illumination of the VALVE OPEN on the Fuel panel indicate?
The crossfeed VALVE OPEN illuminates bright blue while the valve is in transit or the valve position disagrees with the selector position.
What does the dim illumination of an ENG VALVE CLOSED light indicate?
A dim ENG VALVE CLOSED indicates the valve is closed.
What does a bright illumination of a SPAR VALVE CLOSED light indicate?
A bright SPAR VALVE CLOSED light indicates the respective valve is in transit or disagrees with the start lever or FIRE SWITCH position.
Where could the APU suction feed fuel from?
If the fuel pumps are not operating, fuel is suction-fed from main tank No. 1 only.
