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H145 > ATA 28 (FUEL SYSTEM) > Flashcards

ATA 28 (FUEL SYSTEM) Flashcards

1
Q

The crashlanding safety requirements that are required in this system contain what?

A

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.

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2
Q

Why are the fuel lines shrouded?

A

To prevent any fuel entering the the internal fuselage in the casecase of leakage.

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3
Q

What happens to any fuel leakage caught in the shrouded fuel lines?

A

The will be dumped overboard via the fuelage drain system.

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4
Q

How many fuel tanks are there and what are they called?

A

3 Fuel tanks in total. The suppy tank with 2 fuel cells, fwd main tank, aft main tank

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5
Q

How many equipment plates are there and where are they located?

A

5 in total. 2 equipment plates in the Supply and FWD main tank, 1 equipment plate in the AFT main tank.

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6
Q

What are the H145 fuel tanks made from?

A

Kevlar coated with polyurethane.

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7
Q

How many venitlation ports does the fuel system have?

A

2 per tank, 6 in total.

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8
Q

How are the fuel tanks connected?

A

By overflow channels.

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9
Q

What is located inside the Supply tank giving it two seperate fuel cells?

A

a bulkhead.

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10
Q

Which overflow channel is positioned higher?

A

The r/h fuel cell.

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11
Q

What is the purpose of the higher overflow channel in the r/h supply tank fuel cell?

A

to give 2-3 minutes more fuel to prevent a double engine flame out.

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12
Q

How many overflow channels between the FWD and AFT tank?

A

3

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13
Q

What is the purpose of the fuel ventilation system?

A

To keep the tank bladders unpressurized under all operating conditions, and to allow air to escape when refueling.

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14
Q

What does the Fuel vent system comprise?

A

Vent lines, refuel vent lines, Air-no-fuel Valves & expansion box

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15
Q

What is the purpose of the Fuel expansion box?

A

To allow expansion of fuel during temperture changes therfore keeping the system depressurised and recieve the dumped fuel from start up.

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16
Q

Where are the fuel prime pumps located?

A

On the Supply tank equipment plates.

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17
Q

Where are the transfer pumps located?

A

On the FWD main tank equipment plate.

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18
Q

What is the purpose of the Transfer pumps?

A

To keep feul in the supply tank.

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19
Q

What are the FWD main tank pumps called?

A

FWD and AFT transfer pumps.

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20
Q

What type of pump is in the AFT main tanks?

A

A jet type pump.

21
Q

How many transfer pumps are required under full engine power?

A

One pump is sifficient enough to keep supply tanks full.

22
Q

What type of valce is the shut-off valve?

A

Ball valve.

23
Q

What happens when the prime pump is switched on?

A

Fuel is pumped to the fuel metering unit and ruturns into the expansion box. Purge operation stops around 40% N1.

24
Q

Equipment plates installed to the supply tank are equipped with what?

A

A prime pump, a fuel quantity transmitter with low fuel sensor and a drain valve.

25
Q

Equipment plates installed to the FWD Main tank are equipped with what?

A

A transfer pump, a fuel quantity transmitter and a drain valve.

26
Q

Equipment plates installed to the AFT main tank are equipped with what?

A

A transfer pump, a fuel quantity transmitter and a drain valve.

27
Q

What type of pump are the fuel pumps?

A

Canister type fuel pumps.

28
Q

All four pumps are identical. True or False?

A

True

29
Q

What is the outlet px of the fuel pump?

A

1 bar (14.5 PSI)

30
Q

What is the maximum dry operating time of the fuel pump?

A

20 minutes

31
Q

Where is the FWD transfer pump power supplied from?

A

ESS BUS 1

32
Q

Wh0ere is the AFT transfer pump power supplied from?

A

SHED BUS 2

33
Q

L/H prime pump power is supplied from where?

A

ESS BUS 1

34
Q

R/H prime pump power is supplied from where?

A

ESS BUS 2

35
Q

What creates the vacuum in the jet pump’s suction chamber to draw fuel from the aft main tank?

A

Motive pressure fuel tapped from the transfer pumps.

36
Q

How is the fuel shut-off valve monitored?

A

By two means - Valve position & valve movement.

37
Q

How is the shut-off valve position monitored?

A

By two micro switches.

38
Q

When does the JET FUEL PUMP caution display?

A

FWD tank is less thann 15kg but the AFT is still more thn 10kg

39
Q

Which engine will flame out first with low fuel?

A

Left engine

40
Q

When are the prime pumps used?

A

Only on start up.

41
Q

What is powered by ESS BUS 1&2?

A

Any system critical to flight.

42
Q

Fuel shut off valve gives what type of notification on the MASTER LIST?

A

a Caution

43
Q

What type of fuel probes are used in the H145?

A

Concentric capacitor type probes.

44
Q

FUEL QTY DEG will appear on the master list when?

A

Failure of of one FWD tank transmitter, or AFT transmitter.

45
Q

FUEL QTY FAIL will appear on the master list when?

A

If both FWD tank transmitters fail, or one supply tank transmitter fails

46
Q

What weight does the fuel cells drop to to give yellow FUEL RESERVE ?

A

43kg in the l/h, 49kg in the r/h.

47
Q

What weigth does the fuel drop to to give a red LOW fuel warning?

A

26kgW

48
Q

hat type is the low fuel sensor?

A

Thermistor.

49
Q
A

H145 (20 decks)

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