Fuel System Flashcards
How is the fuel moved from the main tanks to the collector tanks?
Scavenge ejectors (gravity line as a backup)
How is the fuel moved from the center tank to the main tanks?
Transfer ejectors
How is the fuel moved from the collector tanks to the engine driven high pressure fuel pump?
Main ejectors (fuel boost pumps are backup)
What is the function of the electric fuel boost pumps?
To provide initial fuel for engine start and to back up the main ejectors
What is the flight deck indication of a high pressure fuel pump failure?
Engine flameout
What is the maximum fuel imbalance?
300 lbs for takeoff and 800 lbs all other times
When will the fuel system automatically start transferring fuel?
200 lb fuel imbalance
When are the boost pumps automatically energized?
Low pressure from the main ejectors (only if the pumps are armed)
Where is the high pressure fuel pump located?
N2 accessory gearbox
Where is the bulk fuel temperature taken?
Right main tank
What is the minimum bulk fuel temp for takeoff? During flight?
- 30 Celsius / above - 40 Celsius
How is the engine fuel heated?
Fuel/oil heat exchanger
What is the minimum engine fuel temp for takeoff?
+5 Celsius
What is the limitation for takeoff if the center tank has > 500 lbs of fuel?
Each main tank must have > 4400 lbs
Which bus powers the refuel/defuel panel and the refuel/defuel SOVs?
APU battery direct bus
