12 Fuel Flashcards
a. How many fuel tanks does the aircraft have?
b. Howaretheydesignated?
a. Three
b. Center, left and right main tanks
Where are the fuel quantities displayed?
Primary EICAS display and FUEL synoptic
During normal operation where can individual tank quantity be displayed?
On the FUEL synoptic
Where is the fuel temperature displayed?
Primary EICAS display and FUEL synoptic
Where do you enter the fuel freeze temperature?
The FMC CDU
List the circumstances that cause the expanded fuel indications to appear on EICAS?
- The crossfeed valve open
- One or more fuel tank quantity indications are inoperative
- The FUEL IN CENTER alert message is displayed
- The FUEL QTY LOW alert message is displayed
- The FUEL LOW CENTER alert message is displayed
- The FUEL FLOW ENG alert message is displayed
- The INSUFFICIENT FUEL alert message is displayed
- The FUEL IMBALANCE alert message is displayed
- The airplane is on the ground and both engine(s) off
- The balance system is active
- The balance system is selected on and fuel is already balanced
What indicates the low tank on the expanded EICAS during a fuel tank quantity imbalance?
A solid white fuel imbalance pointer is displayed if:
• The FUEL IMBALANCE message is not displayed and the main tank fuel differs by more than 100 kilograms, and
• Either the crossfeed valve is open or the balance system is ON
What is indicated by the fuel imbalance pointer flashing?
The pointer flashes if fuel balance or crossfeed is going in the wrong direction
What indications on EICAS are displayed as tank imbalance falls below 100 Kgs?
The FUEL BALANCED replaces FUEL QTY and flashes for 5 seconds
What will happen as actual fuel temperature approaches preset fuel freeze temperature?
The fuel temperature on the EICAS display turns amber along with a “-“ indication
What condition generates an EICAS FUEL DISAGREE advisory message?
The totalizer fuel quantity and the FMC calculated fuel quantity disagree
a. How is the CALCULATED fuel quantity obtained? b. Which system provides the “TOTALIZER” value?
a. Quantity at engine start minus fuel used b. The totalizer fuel quantity system
a. How many AC fuel pumps does each tank have?
b. Do the centre pumps produce the same pressure as main tank pumps?
c. With all tanks full and pumps operating, which tank supplies the engines?
a. Two AC–powered fuel pumps
b. No, they have a higher output pressure
c. Center
a. In which tank is the DC fuel pump
b. When does it operate?
c. What will cause automatic shut down of the DC fuel pump?
a. The Left main tank
b. When AC power is not available and the APU selector is ON
c. When AC power available
How does the fuel system respond if electrical power sources are limited?
Certain fuel pumps may be load shed until enough electrical power is available
If a main tank fuel pump fails:
a. Will selecting the pump switch off remove the message and light?
b. Is the engine or aircraft operation affected with a tank pump OFF?
a. No
b. No, a single pump can supply sufficient fuel to operate one engine under all conditions
With the Centre tank empty, if both left main tank pumps fail, how is the engine affected?
The engine can draw fuel from its main tank through a suction feed line that bypasses the pumps
In flight, if the Centre tank empties, and both centre pump low PRESS lights are illuminated, what will happen to the lights (and associated EICAS messages) when the pumps are switched OFF?
The lights and the messages are inhibited
What is the normal selection of the crossfeed switch?
Off, the crossfeed valve is closed during normal operations
What is indicated if a crossfeed switch VALVE light remained illuminated after selection?
The crossfeed valve is not in the selected position
The Fuel Balance System enables fuel to be transferred between which tanks?
The main tanks
Does the Fuel Balance System operate with the centre tank pumps on?
No
From which tanks can fuel be jettisoned?
All tanks
What is the first action to jettison fuel?
Pushing the FUEL JETTISON ARM switch to select ARMED
To what quantity will fuel be automatically jettisoned?
Fuel quantity TO REMAIN is set to maximum landing weight (MLW) automatically
Where can jettison time be observed?
Jettison time is displayed in minutes on the fuel synoptic
Can the jettison nozzles be opened on the ground?
No
Can all the main and centre tank fuel be jettisoned?
No, main tanks will reduce to 3,900Kgs per tank, centre tank will empty
a. How can the fuel TO REMAIN be selected manually?
b. How will the EICAS fuel quantity display change following a manual selection?
c. How can MLW be reset following a manual selection?
a. Pull on and rotate the TO REMAIN selector to manually decrease or increase the TO REMAIN quantity
b. MAN replaces MLW
c. Push in the FUEL TO REMAIN selector
