10 / 20

Refer to figure.
Which of these statements about the fuel system in the annex are correct or incorrect?

1. If the AC fuel pumps are not running in the system configuration shown in the annex, it is still possible to feed both engines from the main tanks
2. If the APU isolation valve opens, the APU fuel shut off valve is closed and there is no AC power, the DC fuel pump can supply fuel to the engines

  • A
    1 is correct, 2 is correct.
  • B
    1 is incorrect, 2 is correct.
  • C
    1 is correct, 2 is incorrect.
  • D
    1 is incorrect, 2 is incorrect.
Refer to figures.
"1. If the AC fuel pumps are not running in the system configuration shown in the annex, it is still possible to feed both engines from the main tanks." CORRECT
  • If all AC pumps do not work (and the DC pump cannot feed fuel to the engines as in the situation) the engines will keep running thanks to the HP pump located in each engine which will still be able to "suck in" fuel, as long as the spar valves and engine shut-off valve are OPEN.
    Even in the event of total AC power loss, fuel flow to all engines must be ensured.
"2. If the APU isolation valve opens, the APU fuel shut off valve is closed and there is no AC power, the DC fuel pump can supply fuel to the engines." CORRECT
  • The APU isolation valve is opened to supply positive head of fuel from the DC pump for engine start. Once the engines achieve a specified rpm, ground idle perhaps, the APU isolation valve is closed automatically.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.

  • Poland
    8
  • Lithuania
    3
  • Czech Republic
    2
  • Austro Control
    1
  • Greece
    1
  • Hungary
    1
  • Italy
    1
  • Portugal
    1
Keyboard Shortcut Use Keyboard Shortcuts