FUEL SYSTEM Flashcards
Where is the fuel temperature sensor located?
Right collector tank.
How many pumps are there in each tank?
3 pumps
- One ejector fuel pump
- One scavenge ejector pump
- One electric fuel boost pump
What powers the ejector fuel pump?
Motive Flow
What is the purpose of the scavenge pumps?
They maintain the fuel level in the collector tank, even during uncoordinated maneuvers, ensuring a constant flow of fuel to the engine during normal flight.
What is the purpose of the electric fuel boost pumps?
They provide positive fuel pressure during engine starting, crossfeed operations, and as a back up when the primary engine feed (ejector pump) fails.
How do you close the fuel shut off valve?
ONLY the actuation of the fire shut off push button in the cockpit closes the shut off valve.
What cockpit warnings does the Electronic fuel control unit (EFCU) display?
- Each collector tank level is below 310 lbs. (low level)
- The Imbalance Between both wing tanks is at 220 lbs.
- Low pressure condition at each engine inlet.
- Pressure switch fails to detect low pressure at each engine inlet.
Total fuel quantity.
5401 lbs.
Maximum fuel Imbalance (all flight regimes)
220 lbs.
FUEL XFEED limitation
Do not take off or land with FUEL XFEED set to LO 1 or LO 2.
Usable Fuel
5352 lbs.
Average Fuel Consumption first 2 hours of flight?
1st hour: 1500 lbs.
2nd hour: 1000 lbs.
if you are using the #2 engine as a power source, what is the fuel consumption?
200-280 lbs/hr
If you leave the Red Guarded switches open (ON), in the Fueling Panel, what happens?
It will generate Yellow X’s on the EICAS Fuel numbers.
During a fuel imbalance condition you get a FUEL IMBALANCE CAS message. You begin to crossfeed (always point at the low tank). At what point during the crossfeed do you expect to see the CAS message go away?
Until the imbalance is 88 lbs.
At what point during fuel crossfeeding do you expect to see the FUEL EQUAL CAS message go away?
At Less than 44lbs imbalance.
What Buses power the #1 and the #2 electric boost pumps?
1 boost pump is powered by the EMER BUS
Single Point Refueling Pressure
10-50 PSI
What is the purpose of the Surge Tank?
Fuel expansion
How many fuel pumps are in each collector tank?
2 (Ejector and Electric boost pump)
