Fuel Flashcards
Where is the fuel tank temperature taken and what is MIN fuel temperature?
Taken from the left tank and MIN fuel temperature is -40 degrees C.
How many fuel tanks does the airplane have?
2 integrated tanks
What types of fuel pumps are in each wing?
Primary ejector pump
ACMP
DCMP (right tank)
3 scavenge ejector pumps
What is the Primary ejector pump?
Venturi pump with no moving parts and no electrical power used by the respective engine
Powered by motive flow
What is the purpose of AC Fuel pumps?
Backup pump in case of primary ejector pump failure
Engine start
Crossfeed operations
AC Pump 2 provides fuel to the APU when the engine driven pump EDP2 is not running. Powered by AC ESS Bus
AC Pump 1 is powered by AC BUS 1
What is the purpose of DC Fuel Pump?
Provides pressurized fuel for normal APU start when AC power or the AC fuel pump 2 is not available. Located in the right wing. Powered by DCESS Bus 2
What is the purpose of the scavenge pumps?
Maintain adequate fuel level in the collector box
What pump(s) is used once the engine is started?
Associated primary ejector pump
What is the purpose of the collector box?
Keeps the fuel pumps submerged (ejector pumps)
Ensures constant fuel flow to the respective engine
What is the surge/vent tank?
Collects fuel during wing-down maneuvers and returns it to the main tanks once the wings are level
Equalizes tank pressure with atmosphere in flight and during refueling
Can fuel be transferred from tank-to-tank or be dumped overboard?
No
What happens when the crossfeed switch is selected to LOW 1?
Crossfeed valve open.
Commands the ACMP 2 to ‘ON’ to provide fuel from the right tank to both engines.
What is the only way to close the engine fuel SOV?
Pull the associated engine fire extinguishing handle
When will the FUEL 1(2) LOW LEVEL EICAS be presented?
660 lbs of fuel remaining in the associated tank
What is the Total maximum usable fuel quantity?
Total maximum usable fuel is 20,785 lbs.
