Fuel System Flashcards
How is fuel moved from the center tank to the wing tanks
Tansfer ejectors
How is fuel moved from the wing tanks to the collecter tanks
Scavenge ejectors, and gravity
How is fuel moved from the collector tanks to the engine driven high pressure fuel pumps
Main ejectors
Backed up by DC powered boost pumps
What is the function of the electric boost pumps
To supply fuel to the engines when main ejector pressure is low
Will an engine continue to run with a failed engine driven fuel pump
No
Max fuel imbalance
300 lbs for takeoff
800 lbs in all other phases
How many ways can we crossflow fuel
3
Automatically, manually, and gravity
When will the auto crossflow system begin transferring fuel
200 lb fuel imbalance
When will the auto crossflow system stop transferring fuel
When the fuel quantity of the low tank exceeds the other tank by 50 lbs
When are the boost pumps automatically energized
When low pressure is detected at the main ejectors
If the boost pumps are armed
Where is bulk fuel temperature measured
Right main tank
What is the minimum bulk fuel temperature for takeoff
-30 degrees C
What is the minimum bulk fuel temperature during flight
-40 degrees C
How is fuel heated
Fuel/heat exchanger
What is the minimum engine fuel temperature for takeoff
+5 C
