Q-FUEL SYSTEM Flashcards
Can you transfer fuel from engine to engine ?
NO
only tank to tank transfer is available, no engine cross-feed
What is the minimum and maximum fuel temperature
0-71 degrees
71 the red light comes on
where does the fuel for the APU come from ?
it comes from the left tank
the left tank feeds the left engine and the APU
how many bays does each fuel tank have ?
2
surge bay
collector bay
what will be the indication of a tank imbalance ?
AMBER BALANCE displayed on ED
How is Low pressure provided in the fuel system ?
primary ejector fuel pump
how does the magnetic dip stick work ?
its accessed from the bottom of the wing. the rod moves down slowly until the rod magnet is attracted by the float magnet and gives a fuel remaining on the main tank in units US gallons or litres
The reading is only 85% accurate
how does the fuel get from the main tank to the collector bay ?
VIA a flapper valve and fuel scavenger ejector pumps in each section of the main tank
how is the fuel measured for display on the MFD’s and ED’s
a FQC ( fuel quantity computer ) uses 9 probe sensors in each main tank
where else can you see the fuel quantity other then on the ED or MFD fuel page ?
on the refuel and de fuel panel located at the back of right engine nacelle
what do the surge tanks do ?
they are used for main tank and venting and fuel recovery
When does the TANK FUEL LOW light come on ?
when
305 lbs of fuel remaining in the collector tank
Park break is off
or the engine is running that has the low fuel
what is the consequences of taking off with the FUELING ON caution light ?
this means that the fuelling panel is still open . ( Not secure )
Whats happening when #1 or #2 ENG FUEL PRESS light comes on ?
the pressure in the engine driven pump has dropped below a preset limit.
what is the AUX TANK PUMP ?
each collector tank has an AUX pump used as a back up, and for takeoff and landings in case the primary jet pump in the collector tank doesn’t provide enough pressure.
What are the indications if the fuel temperature are out of limits ?
AMBER-Below 0
RED-Above 71
what is the purpose of the DUMP VALVE ?
it prevents the tank from over pressurizing while fuelling
what is the green filled circle light in the fuel page transfer screen mean ?
it mens the aux tank has come on automatically
rmember to not leave the fuel page on the MFD until the transfer is complete
Where is the temp sensor for fuel temp readings ?
the left collector bay
How much PSI is the engine providing on takeoff ?
1200 PSI
Where does the APU get its fuel from ?
The left Collector Bay
When refuelling what 3 lights must be on ?
Master Valve closed
Refuel/ Shutoff tank 1
Refuel/ Shutoff tank 2
If one fuel probe fails what do you get on the display ?
Dashes in the fuel reading
Fuel venting
2 outboard tank vents
float valves
one inboard vent line
Fuelling and refuelling valve is powered by what ?
The Hot Batt buss
The refuelling pressure must be what ?
20 PSI min
50 PSI max
Where is the engine driven fuel pump ?
The AGB
Pulling he T-handle, cuts fuel off at what points ?
Collector tank and the FMU
FOHE
Fuel oil heat exchanger
