Fuel System Flashcards
What are the fuel quantities for gravity refueling?
700: Total - 14,580 lbs, Mains - 7,290 lbs
900: Total - 14,810 lbs, Mains - 7,405 lbs
What are the duel quantities for pressure refueling?
700/900/900EP - Total 19,594 lbs, Mains 7,492 lbs, Center 4,610 lbs
How is the fuel moved from the center tank to the main tanks?
Transfer ejectors
How is fuel moved from the main tanks to the collector tanks?
Scavenge ejectors (gravity line used as a 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 lbs fuel imbalance
When are the boost pumps automatically energized?
Low pressure from the main ejectors (if the pumps are armed)
Where is the high pressure fuel pump located?
N2 accessory gearbox
Where is bulk fuel temperature taken?
Right main tank
What is the minimum bulk fuel temperature for takeoff (Jet A)?
-30 degrees C
What is the minimum bulk fuel temperature during flight (Jet A)?
-40 degrees C
How is the engine fuel heated?
Fuel/oil heat exchanger
