Fuel System Flashcards
(34 cards)
Where are the fuel quantities displayed?
EICAS and Fuel synoptic
Where is the fuel temperature displayed?
EICAS and Fuel synoptic display. Synoptic also shows fuel minimum temperature.
Do the centre pumps produce the same pressure as the main tank pumps?
Override/Jettison pumps in centre tank have a higher output pressure.
With all tanks full and all pumps operating, which tank supplies the engines?
Centre tank
From which tanks can fuel be jettisoned?
All tanks
Where can jettison time be observed?
Fuel synoptic display only.
On the ground during start, how many tank pumps will operate with only one electrical power source?
Only LEFT AFT fuel pump will operate with APU running. During starting of right engine, RIGHT AFT pump will energize.
What is indicated if the crossfeed switch VALVE light remains illuminated after selection during manual operation?
Crossfeed valve is in transit, failed in the shutoff position. Fuel manifolds are not connected.
Where can the fuel freezing temperature be entered?
CDU, “PERF INIT” page
What will happen as actual fuel temperature approaches the preset fuel freeze temperature?
EICAS indication and indication on fuel synoptic page turns amber.
Is the engine or aircraft operation affected with a tank pump OFF?
No, a single pump is sufficient to operate the engine under all conditions.
If a main tank fuel pump fails, will selecting the pump switch off remove the EICAS message and pump PRESS light?
No
Which tank is the DC fuel pump in?
Left main tank
When does the DC fuel pump operate?
With the APU switch on and no AC power available.
If operating, what will cause automatic shutdown of the DC fuel pump?
When AC power becomes available.
Can the jettison nozzles be operated on the ground?
No, only in flight
Can all the main and centre tank fuel be jettisoned?
No, at least 3900kg of fuel will remain in each main tank after fuel jettison.
What condition generates a FMC “Fuel Disagree” message?
When there is a discrepancy between the totalizer fuel quantity and the FMC calculated fuel quantity.
In which tank is fuel temperature measured?
Measured in all tanks.
When are the expanded fuel indications shown on EICAS?
- Crossfeed valve open
- One or more quantity indicators inop
- “FUEL IN CENTER”
- “FUEL LOW CENTER”
- “FUEL QTY LOW”
- ”INSUFFICIENT FUEL”
- ”FUEL FLOW ENG”
- “FUEL IMBALANCE”
- Airplane on the ground with both engines off
- Balance system is active
- Balance system selected on and fuel is already balanced
Where do the surge tanks drain to?
Respective main tank
When are the center fuel pump PRESS lights illuminated?
With low pump output pressure with the switch selected ON
When is the fuel scavenge system activated?
When either main tank is below 16.000kg and the center fuel pumps are off.
When is the fuel scavenge system inhibited?
If an engine is on suction feed.
