Fuel

Question 1

Fuel Transfer Isolation Button pushed in

Answer 1

interrupts the fuel transfer from auxiliary tanks to the wing tanks

Question 2

How many fuel tanks

Answer 2

• 2 x wing tanks

- 2 x aux tanks located in pressurized fwd and aft cargo (6 fuel modules in fwd, 7 fuel modules in aft)

Question 3

How is fuel transfer from aux tanks

Answer 3

• fuel transfers to the wings only

- via differential pressure, or dedicated electrical pumps if pressure is not enough

Question 4

Components in each wing tank

Answer 4

• ejector fuel pump
• AC electric fuel pump
• 3 x scavenge ejector pump
• DC fuel pump (right tank only)

Question 5

AC Fuel Pump logic

Answer 5

Supply fuel during:

• onside engine start
• cross side engine during x-bleed engine start
• APU operating with engines off
• back up during ejector pump failure

Question 6

How much fuel in tank at FUEL 1(2) LOW LEVEL

Answer 6

400 kg (880 lbs) in respective tank

Question 7

Refueling/Defueling logic of Aux tanks

Answer 7

FWD AUX:
Refuel - aft most module first
Defuel - fwd most module first

AFT AUX
Refuel - fwd most module first
Defuel - aft most module first

Question 8

Max Fuel imbalance between wing tanks

Answer 8

800 lbs