Fuel System

Question 1

How is fuel transferred from the centre tank?

A. Air pressure is supplied from the inboard engines to force the fuel into each wing tank
B. By gravity, assisted by jet pumps
C. Normally the inner boost pumps would power transfer jet pumps
D. It is pumped out by the centre tank boost pumps

Answer 1

C. Normally the inner boost pumps would power transfer jet pumps

Question 2

Why are the inner feed tank jet pumps necessary, in addition to boost pumps?

A. To ensure that the inner boost pump always feeds the outer engine
B. They are not really required as gravity feed is sufficient
C. Because gravity alone is insufficient to keep the inner feed tank full at low fuel states
D. To transfer fuel from the centre tank and auxiliaries

Answer 2

C. Because gravity alone is insufficient to keep the inner feed tank full at low fuel states

Question 3

If power to the boost pumps fails, how are the jet pumps powered?

A. The jet pumps are not powered, gravity flow alone is used
B. The hydraulically powered standby pumps power the 4 inner feed tank jet pumps only
C. The jet pumps are powered by yellow system hydraulics
D. The standby generator is the alternative power supply to the boost pumps

Answer 3

B. The hydraulically powered standby pumps power the 4 inner feed tank jet pumps only

Question 4

What will happen to the engines if the boost pumps and the hydraulic fuel pumps fail with a fuel load of 3000kg in each wing tank?

A. All engines will flame out in 23 minutes
B. They will continue running on suction feed until the wing tanks empty
C. Above 2000kg in each wing tank, the engines run normally on suction feed
D. The outboards will be immediately isolated as the inner feed tank fuel level falls below the high level weir

Answer 4

C. Above 2000kg in each wing tank, the engines run normally on suction feed

Question 5

Is it likely that an inner feed tank would be isolated?

A. Yes if the boost pump fails
B. Yes if the boost pump and standby pump fail
C. Yes if the boost pump, standby pump and common feed fail
D. No

Answer 5

D. No

Question 6

In flight, the fuel imbalance in the wing tanks must not exceed ___kg?

Answer 6

680kg

Question 7

If the centre tank fails the transfer fuel to one wing tank ___kg of unusable fuel will be left in the centre tank

Answer 7

180kg