Fuel System

Question 1

How are the aircraft’s fuel tanks configured

Answer 1

1) One tank in each wing divided into an Outer and Inner Cell

2) Center Tank located in the center of the fuselage

Question 2

What is the fuel capacity when all tanks are full

Answer 2

42,000 lbs

Question 3

Are the surge tanks displayed on the ECAM fuel page? Where are they located

Answer 3

Located outboard of each outer cell and not displayed on the ECAM fuel page

Question 4

What is the normal fuel loading sequence. Is the center tank normally filled without filling wing tanks first

Answer 4

1) Outer wing tanks filled to capacity first, followed by inner then center

2) No center tank is not normally filled without first filling wing tanks

Question 5

What is the max fuel imbalance between the wing tank inner cells

Answer 5

approx 3300 lbs

Question 6

How many total fuel pumps are there and where are they located?

Answer 6

6 electrically powered total:
- 2 in each wing tank inner cell
- 2 in center tank

Question 7

If there is fuel in the center tank, what is the normal automatic fuel feed priority if flaps are fully retracted/ extended?

Answer 7

1) Flaps FULLY retracted- Center Fuel is consumed first followed by wing tank fuel

2) Flaps Extended - center pumps automatically shut off per auto logic, allowing wings tank fuel to be consumed

Question 8

What are pressure reducers, when will they operate and which pumps are equipped with them?

Answer 8

1) Allow center tank pump pressure to preferentially supply the respective engine

2) Operate only when flaps are fully retracted

3) Only the wing tank pumps are equipped with pressure reducers.

Question 9

What are the functions of the L and R TK PUMPS pbs

Answer 9

1) On (light out) - pump runs continuously until pb is selected off

2) OFF (white) - pump is deactivated and remains off until pb is selected on.

Question 10

what is going on if you get a LO (amber) indication on the ECAM

Answer 10

Pump is on but pump pressure is low

Question 11

Are wing tank pumps equipped with automated logic?

Answer 11

No - must always be manually controlled with respective pbs

Question 12

What are the functions of the MODE SEL pb

Answer 12

1) AUTO (light out) - if CTR TK PUMP pbs IS on (light out), the center tank pumps will be automatically activated and deactivated as required by system logic

2) MAN (white) - auto pump activation/ deactivation logic is off. Center pumps must be manually controlled

Question 13

What are the ECAM indications when Center Tank fuel is being consumed

Answer 13

1) CTR TK FEEDG appears on the E/WD memo section
2) On the ECAM FUEL page, the center tank pump indications will be inline green

Question 14

When will the transfer valves from the outer cell automatically open, allowing fuel to gravity feed into the respective inner cell?

Answer 14

When either wing tank inner fuel level reaches approximately 1650lbs

Question 15

What are the ECAM indications when the transfer valves are open?

Answer 15

1) On the ECAM FUEL page they will appear in the horizontal position

2) OUTR TK FUEL XFRD (green) appears on the E/WD memo section

Question 16

What is the indication when the transfer valves are in transit

Answer 16

amber diagonal lines

Question 17

When does the F. USED indications reset to zero

Answer 17

Automatically during engine start

Question 18

What are the locations of the following valve indications on the ECAM FUEL page:

1) Crossfeed Valve
2) APU Fuel Valve
3) Engine Low Pressure Valve

Answer 18

1) Crossfeed Valve - directly above the CTR text
2) APU Fuel Valve - under the white APU
3) Engine Low Pressure Valve - directly below the engines F. USED quantity number

Question 19

Where are the temp indications located on the ECAM FUEL page?

Answer 19

Outer and Inner compartment temps are displayed directly below the respective compartment on the ECAM FUEL page

Question 20

Are fuel temp readings provided for the center tank?

Answer 20

No

Question 21

How is the fuel Crossfeed Valve controlled? What are the positions?

Answer 21

Controlled with the X-FEED pb

1) Closed (Light out) - Valve is closed
2) ON (white) - Valve has been commanded open
3) OPEN (green) - Valve is in the open position

Question 22

What other indications will you get when the Crossfeed valve is open

Answer 22

1) FUEL X FEED (green) appears on the E/WD memo section

2) On the ECAM FUEL page, the crossfeed valve appears as inline green

Question 23

What are the indications of a degraded Fuel Quantity Indication (FQI) system

Answer 23

1) Amber Hash marks cover the last two digits of fuel quantity displays of the FOB indiation and E/WD

AND

2) The individual Fuel Tank Quantities

Question 24

What is the meaning of an amber half box surrounding the FOB indication on the E/WD

Answer 24

Three probably causes, all the result of trapped fuel:

1) Both center tank pumps have failed with usable fuel in the tank
2) Both center tank pumps have been turned off with usable fuel in the tank
3) A wing tank transfer valve has failed to open