Fuel

Question 1

How does the APU receive fuel when all the Engine Pumps are off? Which electrical bus bar supplies power to APU fuel pump?

Answer 1

A special fuel pump supplies fuel for APU startup when fuel feed pressure is low. This pump normally runs off the AC ESS SHED, but runs off the AC STAT INV BUS if the AC ESS SHED fails.

Question 2

What is the minimum fuel quantity for take-off?

Answer 2

1500kg

Question 3

If all tanks contain fuel in flight, what is the normal sequencing of fuel feed?

Answer 3

Centre
Inner (down to 750kg)
Outer

Question 4

How many Transfer Valves are there? What will be ECAM memo when transfer
valves open?

Answer 4

Two electrical transfer valves are mounted in each wing to permit fuel transfer from outer to inner tank. OUTR TK FUEL XFRD

Question 5

When do the transfer valves Open and Close?

Answer 5

Open when inner tanks reach 750kg per side (latched open)

Close on the next refuelling operation

Question 6

How is space made, in the Wing Tanks, to receive Fuel from the IDG cooling system
when the CTR Tank is NOT empty?

Answer 6

When Wing Tank “OVERFULL”, CTR pumps stop.
When Wing Tank “UNDERFULL”, CTR pumps starts.

Question 7

Which tank(s) supply fuel after Engine start after 2 mins with Slats extended?

Answer 7

Inner tanks

Question 8

When does the Centre Tank start supplying fuel after T/O?

Answer 8

Slats retracted

Question 9

During Gravity feeding, which tank supplies the fuel? And how?

Answer 9

Inner tank. Suction valves that are closed by pumps pressure in normal operation, they allow engines to be fed by gravity if the inner tank pumps fail.

Question 10

What causes a FAULT light to illuminate in the MODE SEL Switch?

Answer 10

Position of HP fuel shutoff valve is abnormal or start aborted or malfunction of thrust control.

Question 11

When does the Fuel Used indication reset?

Answer 11

Automatically reset when an engine is started on the ground

Question 12

The amber line through a fuel quantity indicates what?

Answer 12

If the FOB indication is displayed with two dashes across the two least significant digits, the FQI is in degraded mode.

Question 13

Does the Fuel Imbalance condition trigger an Advisory, Caution or Warning?

Answer 13

Advisory

Question 14

If both transfer valves in one wing fail to open would would be indicated on the fuel SD?

Answer 14

Amber box around outer wing fuel quantity