Fuel Flashcards
(41 cards)
How can the airplane be refueled?
- single point adapter
- overwing gravity refueling
What does the fuel control computer do?
- controls auto refueling
- powered crossflow
- fuel transfer
- measures fuel quantity/temperature
What provides venting of the tanks?
2 under-wing NACA vent scoops
Where are the collector tanks located?
Inside the center tank
Which is lower, wing tanks or collector tanks?
Collector tanks
How many pressure relief valves?
3 (1 under each wing, and 1 under the fuselage for the center tank)
What psi will the spring-loaded pressure relief valves actuate?
> 5 psi
How many fuel distribution systems?
2
- engine fuel feed system
- APU fuel feed system
What force operates the ejectors?
Motive flow
Are the boost pumps AC or DC?
DC
Where does the APU fuel feed system get its fuel?
From the left collector tank
Where does the fuel system computer get temperature readings from?
The right tank & just prior to entering the engines
What is the order of transfer ejectors as the fuel flows?
transfer ejectors
scavenge ejectors
main ejectors
What starts the process of motive flow?
Engine driven fuel pumps
Do the 2 boost pumps always turn on together?
Yes
What is the min fuel feed temperature?
5 C
What heats fuel before entering the engine?
Where is it located?
Fuel/oil heat exchanger.
On the engine.
What will close the Engine Fuel Shutoff Valve if pressed?
ENGINE FIRE PUSH switchlight
What will actuate the APU Fuel Shutoff Valve?
APU FIRE PUSH switchlight
PWR/FUEL switchlight
What imbalance of fuel will cause the auto xflow to activate?
> 200 lbs between tanks
When will the auto xflow stop?
When the low tank is +50 lbs of the other tank
When will the FUEL IMBALANCE caution message appear?
> 800 lbs between wing tanks
What is the max allowable fuel imbalance for takeoff?
300 lbs between wing tanks
When will the fuel system computer auto transfer fuel from the center to wing tanks?
When the wing tank reaches 94%
