Fuel Flashcards
How many kilos of fuel can each of the main 2/3 ranks hold?
38,100
Which holds more fuel, CENTER, or tanks 2/3 or 1/4?
CENTER
2/3
1/4
How many kilos of fuel can tanks 1/4 each hold?
13,300kgs
How much do reserve tanks 2/3 hold each?
4000kgs
What is the total useable fuel?
163,042 kgs
What color are the override pumps until system logic activated them?
Cyan (blue)
If all tanks are full which tanks pumps activate to feed the engines first?
CENTER
Before takeoff when takeoff flaps are selected, how does the fuel system configuration change?
The cross feed 2/3 close causing main tank 2/3 pumps to feed their respective engines, meanwhile the CENTER tank pumps still provide fuel to engines 1&4
After takeoff with flaps up how does the fuel system config change?
The 2/3 cross feed valves open allowing the CENTER pumps to now feed all engines
> FUEL LOW CTR L
>FUEL LOW CTR R
In Cruise: Fuel in CENTER tank is less than 1,300 kgs with pump switches on
In Climb: CENTER quant is 3200kgs with pump switches on
Before start: CENTER quantity is <7700kgs and switches on.
When system logic senses low pressure from the CENTER wing tank pumps or they are turned off, what does the system automatically do?
Turns on the 2/3 override/JETT pumps
How does the remaining fuel get used from the CENTER tank when the pumps are off or low press?
Scavenge pumps transfer it to main tanks 2/3
FUEL DISAGREE
Totalizer quantity and FMC calculated fuel disagree.
Objective: decide if a fuel leak is suspected. Select the most accurate fuel value if a leak is not suspected
FUEL IMBAL 1-4
Imbalance of 1360kgs between tanks 1-4
Objective: decide if a fuel leak is suspected. To balance fuel if a leak is NOT suspected.
FUEL IMBAL 2-3
Fuel imbalance of 2720kgs between main tanks 2/3
Objective: decide if a fuel leak is suspected. To balance fuel if a fuel leak NOT suspected.
FUEL IMBALANCE
After the FUEL TANK/ENG message shows there is a longitudinal fuel imbalance of 2,720 kgs between the inboard and outboard main tanks.
Objective: decide if fuel leak suspected. To balance fuel if a fuel leak is not suspected.
> FUEL JETT A, B
A fuel jettison system has failed
FUEL JETT SYS
Total fuel qty is
FUEL JETTISON
Fuel jettison is needed!
When either main tank 2/3 reaches 18100, what does system logic do?
Transfers reserve fuel to the tanks 2/3
FUEL LEAK ENGINE
An in-flight engine fuel leak is suspected.
Objective: verify there is an ENGINE fuel leak. Identify the leaking engine and shut it down.
> FUEL OVD CTR L, R
The CENTER wing tank pump switch is off and one of these occurs:
On the ground: CENTER tank >7700kgs
In Cruise: >1800 kgs
FUEL OVRD 2,3 AFT, FWD
Pump pressure is low
FUEL PRESS CTR L, R
FUEL LOW CTR L, R Message is shown for 60 sec
Or
Pump pressure low
FUEL PRESS ENG 1,2,3,4
Engine on suction feed
Objective: open the cross feed valves to ensure fuel flow. To reconfigure if both pumps are failed in tank 1 or 4.
FUEL PUMP 1,4 AFT, FWD
PRESS
Pump pressure is low
FUEL PUMP 2,3 AFT, FWD
PRESS
Pump pressure is low
FUEL QTY LOW
Qty is <900 kgs in one or more main tanks.
Objective: decide if a fuel
Leak is suspected. Ensure that all fuel is available for use if a fuel leak is not suspected
FUEL RES XFR 2,3
Reserve transfer valve NIPS
> FUEL TANK/ENG
One of these occurs with the cross feed valve 1 or 4 open:
Main tank 2 is <=equal to tank 1
Main tank 3 is <= to tank 4
This indicates it is time to go
direct tank to engine feed.
Basically it’s telling you to stop feeding off the inboards only with the overrides and let each engine take its own feed to keep even balance across the wing.
Turno off 2/3 override pumps then close XFEED valves 1/4
Keep this config til landing
FUEL TEMP LOW
Fuel temp near min
How much fuel can you jettison from the center tank and main tanks?
All the CENTER and up to the standpipes in the mains
FURL TEMP SYS
Fuel temp indication has failed
FUEL XFEED 1,4
Fuel XFEED valve NIPS
Must you close the fuel jettison nozzles after the jettison is complete?
Yes and turn the system off
The system can be confirmed to be deactivated when the jettison synoptic disappears
FUEL XFEED 2,3
Fuel XFEED valve NIPS
> XFEED CONFIG
Fuel cross feed valve Not in CORRECT position
> FUEL XFER 1+4
FUEL XFER MAIN 1&4 Switch is on and one of these occurs:
Airplane on the ground
Inflight: the inboard main tank quantities are more than the outboard main tank quantities
> JETT NOZ ON
Both jettison nozzle valves are open
> JETT NOZ ON L, R
A JETT NOZ Valve is open
> JETT NOZZLE L, R
VALVE
Fuel JETT nozzle valve NIPS
> SCAV PUMP ON
On the ground the CENTER wing tank scavenge pump operates
