FCOM: 28 - Fuel System

Question 1

Apart from storing fuel, what other functions does the fuel system fulfil?

Question 2

Total usable fuel:
A321 NEO
A320 NEO
A320 CEO
A319

Question 3

Which fuel tanks will empty first?

Question 4

How is it possible to close the LP fuel valve?

Question 5

If the inner tank pumps fail, what mechanism takes over?

Question 6

Describe the fuel feed sequence.

Answer 6

Aircraft equipped with jet pumps:
1. Inner tanks empty by 500kg each
2. Centre tracks refill inner tanks using venturi effect jet pumps
3. Inner tanks empty to 750kg each
4. Transfer valves open and fuel from outer tanks starts to refill inner tanks.

Question 7

How does the aircraft decide to use fuel from the centre tank?

Question 8

Which electrical bus supplies the APU fuel pump?

Question 9

What has happened when you get the ECAM: FUEL L(R) OUTER XFR OPEN?

Question 10

Considering imbalance between left and right INNER tanks, what is the maximum imbalance allowed at take off:
Between tanks when one tank is full?
What are the other imbalance limits for take off?

Question 11

Considering imbalance between left and right OUTER tanks, what is the maximum imbalance allowed at take off:
Between tanks when one tank is full?
What are the other imbalance limits for take off?

Question 12

Considering imbalance between left and right INNER tanks, what is the maximum imbalance allowed during flight (including landing):
Between tanks when one tank is full?
What are the other imbalance limits in flight?

Question 13

Considering imbalance between left and right OUTER tanks, what is the maximum imbalance allowed during flight (including landing):
Between tanks when one tank is full?
What are the other imbalance limits in flight?

Question 14

What are the discrepancy limits between planned fuel uplift and actual fuel uplift? What must you do if you exceed these limits?

Question 15

Describe the operation of the FLSCU.

Question 16

What is the fuel tank inerting system?

Question 17

What can you find in the QRH to deal with fuel issues?

Question 18

How is the APU fuel pump powered?

Question 19

Amber box around FOB?

Question 20

Roughly how quickly can fuel cool in the wing tanks?

Question 21

What are the signs of a fuel leak?

Question 22

Briefly explain the centre tank logic.

Question 23

How is the IDG cooled? Where does the return fuel get fed to?

Question 24

On a CEO/NEO when do the transfer valves open?

Question 25

When would you see the low level fuel ECAM?

Question 26

What is a jet pump, and why might they have an advantage over the conventional centre tank pump configuration?

Question 27

When operating in colder climates what might you consider to help increase the temperature of the fuel back into the normal range?