Fuel System Flashcards
What are the fuel quantities for pressure refueling
Center: 4,610lbs
Mains: 7,492lbs a side
Total: 19,594lbs
What are the fuel quantities for gravity refueling
Mains only: 7,405lbs a side
Total: 14,810lbs
How is the fuel moved from the center tank to the main tanks
transfer ejectors
How is the 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 lb fuel imbalance
When are the boost pumps automatically energized
Low pressure from the main ejectors is
detected (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 Temp for take-off
Jet A
-30°C
What is the minimum bulk fuel temp during flight
Jet A
above -40°C
How is engine fuel heated
Fuel/oil heat
exchanger
What is the minimum engine fuel temperature
for takeoff
+5°C
What is the takeoff limitation if the center tank has > 500 lbs of fuel
Each main tank must have > 4,400 lbs
Which Bus powers the refuel/defuel panel and refuel/defuel SOVs
APU Battery Direct Bus
Where is the refuel/defuel panel located
The fuselage forward of right wing
Where is the single point adapter located
Right wing root
How many ways are available to crossflow fuel
- Auto, Manual, and Gravity.
When will the auto crossflow system stop transferring fuel
When the fuel quantity of the low tank exceeds the other tank by 50 lbs
What message will be displayed on EICAS whenever the refuel/defuel panel is switched on
AUTO XFLOW INHIB status message
