ATA 28 (FUEL SYSTEM) Flashcards
(49 cards)
The crashlanding safety requirements that are required in this system contain what?
1) Impact-resistant fuel tanks,
2) Flexible fuel supply and hose system
3) Tolerance of load factors in all directions
4) Fuel shut-off to engines in case of emergency landing and/or fire.
Why are the fuel lines shrouded?
To prevent any fuel entering the the internal fuselage in the casecase of leakage.
What happens to any fuel leakage caught in the shrouded fuel lines?
The will be dumped overboard via the fuelage drain system.
How many fuel tanks are there and what are they called?
3 Fuel tanks in total. The suppy tank with 2 fuel cells, fwd main tank, aft main tank
How many equipment plates are there and where are they located?
5 in total. 2 equipment plates in the Supply and FWD main tank, 1 equipment plate in the AFT main tank.
What are the H145 fuel tanks made from?
Kevlar coated with polyurethane.
How many venitlation ports does the fuel system have?
2 per tank, 6 in total.
How are the fuel tanks connected?
By overflow channels.
What is located inside the Supply tank giving it two seperate fuel cells?
a bulkhead.
Which overflow channel is positioned higher?
The r/h fuel cell.
What is the purpose of the higher overflow channel in the r/h supply tank fuel cell?
to give 2-3 minutes more fuel to prevent a double engine flame out.
How many overflow channels between the FWD and AFT tank?
3
What is the purpose of the fuel ventilation system?
To keep the tank bladders unpressurized under all operating conditions, and to allow air to escape when refueling.
What does the Fuel vent system comprise?
Vent lines, refuel vent lines, Air-no-fuel Valves & expansion box
What is the purpose of the Fuel expansion box?
To allow expansion of fuel during temperture changes therfore keeping the system depressurised and recieve the dumped fuel from start up.
Where are the fuel prime pumps located?
On the Supply tank equipment plates.
Where are the transfer pumps located?
On the FWD main tank equipment plate.
What is the purpose of the Transfer pumps?
To keep feul in the supply tank.
What are the FWD main tank pumps called?
FWD and AFT transfer pumps.
What type of pump is in the AFT main tanks?
A jet type pump.
How many transfer pumps are required under full engine power?
One pump is sifficient enough to keep supply tanks full.
What type of valce is the shut-off valve?
Ball valve.
What happens when the prime pump is switched on?
Fuel is pumped to the fuel metering unit and ruturns into the expansion box. Purge operation stops around 40% N1.
Equipment plates installed to the supply tank are equipped with what?
A prime pump, a fuel quantity transmitter with low fuel sensor and a drain valve.
