Fuel Flashcards
what does the fuel system do
- stores fuel in tanks
- distributes fuel during refuelling ops
- supplies fuel to the engines and APU
- circulates fuel to cool the Integrated Drive Generators (IDG)
- keeps fuel in outer tanks for wing bending and flutter relief
what is the center tank capacity
6476kg
what are the inner tank capacities
5435kg
what are the outer tank capacities
691kg
what is the total fuel capacity
18729kg
after the tanks have been filled to capacity, how much can the fuel expand without any spillage
2% (20C temperature increase)
in which tanks are there overpressure protectors
- vent (surge)
- outer
- inner
- center to the left inner
where are the main fuel pumps
- 2 in each INNER tank (4 total)
- 2 in the CTR tank
what is unique about the INNER tank pumps
- Pressure relief sequence valves (when all pumps are on - CTR tank pumps will deliver fuel preferentially)
- suction pumps (allow gravity feeding)
what do the inner tank transfer valves allow
fuel to flow from the outer tank to the inner tank
what does the crossfeed valve allow
- both engines supplied by 1 side; or
- 1 engine supplied by both sides
what closes the ENG LP valve
- ENG MASTER Sw - off
- ENG FIRE Pb - pressed
which pumps do no have suction valves
- CTR TANK pumps
what do suction valves allow
gravity feed of fuel if pump fails
what sequence do the tanks empty
1) center tank
2) inner tank (to 750kg)
3) outer tank (transfers into inner tanks)
what is the center tank pump’s control logic
- when inner tanks full = turns off until approximately 500kg of associated inner tank fuel is used (underfull sensor); then
- inner tank pump turns on
when does the fuel transfer from the outer tank to the inner tank
(sensing description)
- approximately 750kg in the inner tank (based on unaccelerated flight)
- 2 sensors/ inner tank - each controls 1 xfer valve on each side ensuring simultaneous transfer
when the fuel recirculation passes through the IDG and back into the fuel tanks, which fuel tank does it return to
- outer tanks
- if the outer tank is already full then the fuel passes to the inner tank via a spill pipe
when refuelling which tanks does the fuel supply directly into
- outer tank (inner tank via spill pipe)
- center tank
what is the approximate refuel time at nominal pressure
- wing tanks - 17 mins
- all tanks - 20 mins
when do the refuel valves close automatically
- tanks at presel value; OR
- sensors detect high fuel level
what does FQI stand for
Fuel Quantity Indication
what does the FQI system do
- calculates fuel mass, QTY, temp and send info to ECAM
- controls automatic refuelling
how many channels make up the FQI system
2 channels (2nd channel takes over automatically if the 1st channel fails)
