Fuel

Question 1

Recall the aircraft’s fuel tank configuration.

Answer 1

▪ One tank in each wing, divided into an Outer and Inner cell.
▪ A Center tank located in the center of the fuselage.

NOTE: Surge tanks, located outboard of each outer cell, are not displayed on the ECAM Fuel page.

Question 2

Explain normal fuel loading sequence.

Answer 2

▪ Wing Tank outer cells are filled to capacity, followed by the inner cells. ▪ Total Wing Tank capacity is 27,500lbs. (13,750lbs per wing).
▪ Center Tank filled as required once Wing Tanks are full.

Note: The Center Tank is normally not filled without first having the wing tanks filled to capacity

Question 3

What is the maximum fuel imbalance between the wing tank inner cells?

Answer 3

▪ 3,300 lbs.

Question 4

Recall the number and location of aircraft fuel pumps.

Answer 4

▪ A total of 6 electrically powered fuel pumps.
• 2 in each wing tank inner cell
• 2 in the center tank

Question 5

With fuel in the Center Tank, explain the normal (automatic) fuel feed priority With flaps fully retracted?

Answer 5

With flaps fully retracted: center tank fuel is consumed first followed by wing tank fuel:
▪ Only the wing tank pumps are equipped with pressure reducers.
▪ Pressure reducers allow center tank pump pressure to preferentially supply the respective engine.

Question 6

With fuel in the Center Tank, explain the normal (automatic) fuel feed priority With flaps extended?

Answer 6

With flaps extended: center tank pumps automatically shut off, per auto logic, allowing wing tank fuel to be consumed.

Question 7

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

Answer 7

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

NOTE: When the center pumps are commanded off, per computer logic, pump indications will be horizontal green lines.

Question 8

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

Answer 8

❇️Both transfer valves automatically open when either wing tank inner cell fuel level reaches approximately 1,650lbs.

Question 9

What ECAM indications display when transfer valves are open?

Answer 9

▪ Transfer valve indications on the ECAM FUEL page appear in the horizontal position.
▪ OUTR TK FUEL XFRD (green) appears on the E/WD memo section.

NOTE: While the valves are in-transit, they appear as amber diagonal lines.

Question 10

When will the F. USED indications reset to zero?

Answer 10

▪ Automatically during engine start.

Question 11

What is the location of fuel temperature indications on the ECAM FUEL page?

Answer 11

Outer and Inner compartment fuel temperatures are displayed directly below the respective compartment on the ECAM FUEL page.

NOTE: Fuel temperature readings are not provided for the center tank.

Question 12

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

Answer 12

Amber hash marks cover the last two digits of fuel quantity displays of the:
▪ FOB indication on the E/WD. and
▪ The individual fuel tank quantities on the ECAM FUEL page.

Question 13

What are the 3 probable causes of an amber half box surrounding the FOB indication on the E/WD?

Answer 13

There are three probable causes, all as the result of trapped fuel:

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