Fuel Flashcards
What is the aircrafts fuel tank configuration
-One 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
Explain the normal fuel loading sequence
-Wing tank outer cells are filled to capacity, followed be the inner cells
-Total wing Capacity is 27,500lbs (13750 per wing)
-Center tank filled as required once wing tanks are full
What is max fuel imbalance between the wing tank inner cells
approx 3,300 lbs
Recall the number and location of aircraft fuel pumps
A total of 6 electrically powered fuel pumps
-2 in each wing tank inner cell
-2 in the center tank
With fuel in the center tank, explain the normal (automatic) fuel feed priority
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
With flaps extended- center tank pumps automatically shut off, per auto logic, allowing wing tank fuel to be consumed
Recall the function of the L & R TK PUMPS pb
TK PUMPS pb are used to manually control their respective wing tank pumps
ON (lights out)- Pump runs continuously until ob is selected OFF
OFF (white)- pump is deactivated and remains off until pb is selected
NOTE wing tank pumps are NOT equipped with automatic logic. Pump operation is commanded by its respective pb and must always be manually controlled
The function of the MODE SEL pb (fuel)
AUTO (light out)- provided CTR TK PUMP pbs are selected ON (lights out), the center tank pumps will be automatically activated and deactivated as required by computer logic
MAN (white)- automatic pump activation/deactivation logic is off. Center tank must manually be controlled
What are the ECAM indications when Center tank fuel is being consumed
-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 logic, pump indications will be crossline green
Recall when the transfer valves will automatically open, allowing out cell fuel to gravity feed into the respective inner cell
Both transfer valves automatically open when either wing tank inner cell fuel level reaches approx 1650lbs
Recall the ECAM indications when transfer valves are open
-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
When does F. Used indication reset to zero
Automatically during engine start
What is the location of valve indications on the ECAM FUEL page
-Crossfeed valve appears directly above the CTR text
-APU fuel valve appears under the white APU
-Engine Low Pressure fuel valves appear directly below the engines fuel used quantity number
What is the location of fuel temperature indications on the ECAM FUEL page
Outer and inner compartment fuel temperatures are displayed directly below the respective compartment on the ECAM FUEL page
NOTE fuel temp readings are not provided for the center tank
Recall the controls and indications of the fuel crossfeed valve
The fuel crossfeed valve is controlled with the X-FEED pb
-Closed (lights out)- valve closed
-ON (white)- valve has been commanded open
OPEN (green)- valve is in the open position
When the crossfeed valve is open
-FUEL XFEED (green) appears on E/WD memo section
-On ECAM FUEL page, the crossfeed valve appears as in line green
NOTE while in transit, the valve indication appears as an amber circle with a diagonal line
Recall the indications of a degraded Fuel Quantity Indication (FQI) system
Amber hash marks cover the last two digits fuel quantity displays of the FOB indication on the E/WD and the individual fuel tank quantities on the ECAM FUEL page
