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

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. In the system configuration shown in the annex the DC fuel pump can supply fuel to the engines

  • A
    Both 1 and 2 are incorrect.
  • B
    1 is correct, 2 is incorrect.
  • C
    Both 1 and 2 are correct.
  • D
    1 is incorrect, 2 is correct.

Refer to figure.
"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 depicted in the annex) 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. In the system configuration shown in the annex the DC fuel pump can supply fuel to the engines." INCORRECT
  • In the depicted situation, with the APU isolation valve closed and the APU shut off valve open, the purpose of the DC fuel pump is to supply fuel to the APU => Once running the APU will produce AC power for main engine start. DC fuel pump can supply fuel to the engines only if the APU isolation valve opens.

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