Fuel Flashcards
Why is a limitation to not takeoff in automatic powered or gravity crossflow?
prevent inadvertently fuel crossflow
What prevents fuel from flowing towards the wing tip in an uncoordinated turn?
one way check valve, wing ribs
How can the APU receive fuel if the XFLOW/APU pump fails?
right engine fuel feed line if a negative āGā condition occurs. (negative gravity relief valve)
Where is the bulk fuel temperature sensor located?
left main tank
What provides fuel flow for the motive flow pumps?
from engine driven fuel pump
What are names of the three ejector pumps and what does each one do?
- main ejectors_move fuel from collector tank to engine
- scavenge ejector_move fuel from wing tank to collector tank
- transfer ejectors_transfer fuel from center tank to wing tank
What is the difference between fuel crossflow and fuel transfer?
corssflow: between wing tanks
transfer: from the center tank to a wing tank
When AUTO XFLOW is armed, when does crossflow begin and end?
The system operates automatically when a fuel imbalance of 200 lbs is detected and will continue until the previously low tank is 50 lbs above the opposite side tank.
When does fuel transfer begin and end?
When the left or right wing tank drops below 94%, fuel transfer is activated and will continue until the fuel level in the respective tanks is at 97% (starts when wing tank is not full, then stops when wing tank is full)
Where are the collector tanks located?
are located in, but are independent of, the center tank
How much fuel does a collector tank hold?
10 gal.
With the boost pump system armed, what condition activates the systme?
The boost pumps are automatically activated when fuel flow drops below 9 psi.
If one system senses low pressure which pump turns on?
both boost pump
How can the pilot open/close a fuel shutoff?
pushing engine fire push
How is the fuel heated?
fuel/oil heat exchanger
