Fuel System Flashcards
What is the total fuel capacity in kilos?
163,042 kg
What are the fuel capacities of the tanks?
Reserves 1&4: 8,036 kg
Main Tanks 1&4: 26,576 kg
Main Tanks 2&3: 76,263 kg
Centre Tank: 52,167 kg
If fuel is needed in the centre tank, what is the minimum qty it must contain prior to engine start?
1800 kg
In flight, fuel tank temps must be maintained at least how many degrees above the fuel freezing point?
3 degrees Celsius
What is the minimum fuel temp for Jet-A and Jet-B?
Jet-A: -37C
Jet-B: -47C
Where is the fuel temperature measured?
Number 1 main tank
What Xfeed valves automatically close for takeoff?
2 & 3 when flaps are extended to the takeoff position
If number 1 FWD and AFT main fuel tank pumps are INOP, how could I get that fuel to the engines under boost pump pressure?
the QRH procedure will have you use the main tank 1&4 transfer valve
Can you reset a fuel pump CB?
no
How much fuel is jettisoned per hour?
about 2000 kg
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?
CENTER2/31/4
How many kilos of fuel can tanks 1/4 each hold?
13,300kgs
How much do reserve tanks 2/3 hold each?
4000kgs
What 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 onIn Climb: CENTER quant is 3200kgs with pump switches onBefore 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 1-4Objective: 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 2/3Objective: decide if a fuel leak is suspected. To balance fuel if a fuel leak NOT suspected.