Fuel Flashcards
Which tank does the APU receive fuel from?
No.2 Tank
What stops the fuel flow into a tank if it becomes full and how?
Fuel Level Control Valves (FLCV) are electrically operated and allow fuel to flow into the tank. They are spring loaded and shut when electrical power is disrupted or floats close it when tank capacity is reached.
Can the transfer pumps transfer all the fuel out of a main tank?
No, they are positioned such that they cannot transfer or dump all the fuel out of a main tank.
Which tanks have only one transfer pump?
Aux Tanks
What pressure does the booster pumps operate at?
15-24PSI to the engines
What pressure to the transfer pumps operate at?
28-40PSI
Why do the transfer pumps operate at a higher pressure than the boost pumps?
To override the booster pumps when doing cross feeding operations.
What pressure causes the ACAWS advisory notifying a empty tank?
When fuel pressure in the manifold drops below 25.5 +/- 1.5PSI
What do the Start, Stop, Run switches control?
Internal booster pump in their respective tanks.
Each main fuel tank has two transfer pumps, how do you alternate which transfer pump is the engaged one?
When you switch the fuel transfer from OFF to FROM it alternates the active transfer pump.
If conducting cross feeding operations and you experience a power loss, what happens to the cross feed valves?
They remain in their last energised position
In the engine shutdown checklist why does it state to turn the engine start switch to STOP?
Because the fire handle cuts off supply to the nacelle but the booster pump will still be trying to feed the leftover fuel in the system to the engine as long as the switch is still in RUN.
What is the minimum fuel in inboard and outboard main tanks to be in primary fuel management?
7060lbs in the outboard tanks and 6407lbs in the inboard tanks when aux and or external tanks contain usable fuel.
Can you land with fuel in the external tanks?
Yes but it should be avoided if possible to avoid fatigue cracks.
What is the maximum fuel in all tanks to land at >300fpm?
38,000lbs in all tanks and 500 in extl.
