Fuel Flashcards
What kind of fuel tanks are located in each wing?
Fuel tanks are divided into a main tank, a collector tank and a surge tank.
What’s the function of the main tank?
Main storage area for fuel.
What’s the function of the collector tank?
Keeps the (AC, DC, ejector) fuel pumps submerged for a constant fuel flow to the respective engine.
What’s the function of the surge tank?
Collects fuel that can enter the vent system during wing down and uncoordinated maneuvers.
When does the fuel indication turn amber?
Two tanks: 2640lb.
One tank: 1320 lb.
When does the fuel indication turn red?
Two tanks: 1320lb.
One tank: 660lb.
What pumps are located in the main tank?
3 scavenge pumps; maintain the fuel level in the collector tank.
What pumps are located in the collector tank?
Ejector pump, AC fuel pump, DC fuel pump (only in the right tank!).
What does the ejector pump do?
Primary pump; from collector tank to engine.
Venturi ejector/jet pump, no moving parts; relies on motive flow from the engine driven fuel pump (EDP).
What does the AC fuel pump do?
Supplies fuel during engine start,
supplies both engines from a single fuel tank during X-FEED.
Supplies to APU when engine is not running…
Also a back-up to the main ejector pump.
Located in the collector tank, pumps fuel to the engine.
What does the DC fuel pump do?
Only in the right tank!
No AC power or AC pump? Provides power for APU + engine start.
Can be used during an electrical emergency (DC ESS BUS 2) to start APU or engine 2.
XFEED button; what does LOW 1 do?
Opens XFEED valve,
activates AC pump 2, supplies fuel to both engines from the right tank.
LOW2 does the opposite :))))))
When does AC pump 1 automatically turn on when set to AUTO?
Turns on when engine 1 is starting, or XFEED selector set to LOW2, or main ejector pump fails.
Same logic for AC pump 2; but in addition: when APU is starting/running without engine 2 running.
