Fuel System

Question 1

What is the total fuel capacity?

Answer 1

41,285lbs

Question 2

Center tank capacity?

Answer 2

14,281lbs

Question 3

Each inner tank?

Answer 3

11,982lbs

Question 4

Each outer tank?

Answer 4

1,520lbs

Question 5

When does fuel transfer from the outer to inner tanks?

Answer 5

when inner tank level is at 1650 lbs OR when outer tank is overfilled

Question 6

What is significant about the outer tanks?

Answer 6

They can not directly supply fuel to the engine

Question 7

What happens when the inner fuel tank pumps fail?

Answer 7

Suction valves in the inner tanks allow gravity fuel feeding to the engine

Note: Gravity feeding is not available from the center tank.

Question 8

When fuel is used to cool the IDGs, where is the heated fuel deposited?

Answer 8

Outer wing tanks, when full return spill valve returns fuel to the inner tanks

Question 9

What does it mean if the fuel quantity is boxed in amber?

Answer 9

The fuel is unusable

Question 10

When will the fuel quantity pulse?

Answer 10

The difference between fuel quantities in the fuel tanks is greater than 3300lbs, the higher value pulses.

Question 11

What does it mean when FOB has a half amber box around it?

Answer 11

Some fuel is trapped

Question 12

What does the REFUELG memo mean?

Answer 12

The refueling panel door is open, not necessarily that you are currently refueling.

Question 13

What does the FAULT light on the CTR TK MIDE SEL pb mean?

Answer 13

Center tank > 550lbs and either wing <11000lbs

Question 14

What do the FAULT lights on the pump pb mean?

Answer 14

Low Fuel Pressure

Question 15

How long does it take to refuel?

Answer 15

17 to fill wings, 20 to fill all tanks

Question 16

When fueling what tanks fill first and why?

Answer 16

Outer tanks fill then spill inboard to maintain balance.

Question 17

When does the center tank fill?

Answer 17

When fuel load is > 27,004lbs

Question 18

What is significant with the center tank pumps?

Answer 18

Although all pumps are on, the center pumps run at a higher pressure to utilize center tank fuel FIRST

Question 19

Since the Center tank is used first but IDG cooler returns fuel to the wind, what will the system do if the inner tank reaches an overfill level?

Answer 19

The pump for the corresponding side on the center tank will shut off and fuel will be drawn from the inner wing.

Question 20

What will happen when slats are selected or if center tank is low for 5 minutes?

Answer 20

Center tank pumps deactivate with slats, thus you will only run off the wings during TO and landing.

Question 21

The center tank always depletes first, when are the center tank pumps deactivated?

Answer 21

5 minutes after center tank low level

Slats are extended

Overfill of the inner wing tank

Question 22

When the outer fuel tanks transfer to the inner, ~ how much flight time is remaining?

Answer 22

1 hour

Question 23

In the A321, where is fuel always pulled from?

Answer 23

Respective wing tanks only, motive flow pulls fuel out of the center tank.

Note: there is only one wing tank per side on the A321

Question 24

(A321) The wing tank is full, when will the transfer valves allow fuel from the center tank to refill the wing tank?

Answer 24

When the wing tank is reduced by 550 lbs

Question 25

(A321) If ACTs are installed in what order are they depleted?

Answer 25

ACT1 to center
ACT2 to center
Center to Wing

Question 26

(A321) How is fuel transferred from the ACT to the center tank?

Answer 26

Positive Cabin Air Press

It will transfer to center tank when center tank high level is not sensed for 10 minutes

Question 27

(A321) What is the warning when manually selecting the CTR TK MODE SEL pb?

Answer 27

You are responsible for monitoring the center and wing tank fuel levels

Question 28

(A321) Only when would you get a FAULT on the CTR TK XFR pb?

Answer 28

Only when the center tank overflows, NOT when you have a transfer failure.

Question 29

(A321) Fuel is transferred from the ACTs automatically when:

Answer 29

Aircraft is in flight

Slats retracted

ACT contains fuel

Center tank high level not activated for 10 minutes