Fuel System Flashcards
What are the fuel quantities for Gravity refueling?
Total: 14,810 lbs
Mains: 7,405
Center: N/A
How is the fuel moved from the center tank to the main tanks?
Transfer injectors
How is the fuel moved from the main tanks to the collector tanks?
Scavenge ejectors
Gravity line used as backup
How is the fuel moved from the collector tanks to the engine driven high pressure fuel pump?
Main ejectors
backed up by boost pumps
What is the function of the electric 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
800 lbs for all other phases
When will the fuel system automatically begin transferring fuel?
200 lb fuel imbalance
When are the boost pumps automatically energized?
Low pressure from the mind ejectors
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?
-30C
What is the minimum bulk fuel temp during flight?
Above -40C
How is engine fuel heated?
Fuel/oil heat exchanger
What is the minimum engine fuel temperature for takeoff?
+5C
