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Z A320 Systems > Stage 5 Fuel > Flashcards

Stage 5 Fuel Flashcards

1
Q

What is the function of the fuel system? 6 items

A

1) Stores fuel in the tanks.
2) Supplies correct fuel quantities during refueling.
3) Transfers fuel from the center to inner tanks (AO series)
4) Supply fuel to APU
5) Cools the IDG
6) Wing flutter relief by storing fuel in the outer tanks.

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2
Q

By how much can the fuel expand when tanks are full?

A

2% (20ºC temp rise) without spilling

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3
Q

What are the tanks in order? 4

A

ACT - Center tank - Inner tank - Outer tanks - vent surge tank

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4
Q

What is the capacity of the outer tanks in A320?

A

690kg

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5
Q

What is the capacity of the inner tanks in A320?

A

5.5 Tons

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6
Q

What is the capacity of the center tanks in A320?

A

6.5 Tons

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7
Q

The capacity of an ACT?

A

2.4 tons

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8
Q

Total fuel capacity of 320?

A

19 Tons

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9
Q

What are the two main fuel pump systems on the A320?

A

1) 4 Main Fuel Pumps from inner tanks to engines

2) 6 Main Fuel Pumps from Center or inner tanks to the engines

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10
Q

What is the standard fuel density?

A

0.785

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11
Q

What are the pump layouts for AO- and AN- series?

A

AN: 6 pumps provide from the center and inner tanks to engines
AO: 4 pumps from the inner tanks and transfer pumps from the center to inner

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12
Q

How are engines fed on the AO series?

A

Each engine is supplied by two pumps from its side

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13
Q

How are engines fed on the AN series?

A

The engine is by the onside one center or the two engine pumps. Special valves deliver from the center tank preferentially

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14
Q

What does the crossfeed valve accomplish?

A

1) both engines to be fed from one side

2) One engine to be fed from both sides

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15
Q

How is fuel flow to the engine stopped?

A

By shutting off the HP fuel Valves by either:

1) ENG MASTER OFF
2) ENG FIRE PB

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16
Q

How can the engine be supplied in case fuel pumps fail to? Does it apply to all tanks?

A

Suction Valves enable gravity feeding. Center tanks, however, do not have such capability

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17
Q

How doe the CTR tank XFR valves work?

A

The FLSCU opens the XFR valves automatically when 500 kg is used from the inner tanks. It works solely by suction

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18
Q

Will the XFR valves stop transferring fuel to the wing tanks when they are in MAN Mode?

A

No, if the inner tank is full it can overflow if the pumps aren’t off

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19
Q

When does the fuel from the outer tanks move into the inner tanks? What cautions may exist with that movement?

A

When the inner tanks go below 750kg. Fuel may be moved earlier if inner level is sensed differently due to descent/accelerations and cause a low-level caution

20
Q

When do ACT tanks start transferring?

A

After slat retraction on takeoff and center tank sensor is dry for 10mins

21
Q

How is the APU fed?

A

From the left feed line and low-pressure pumps. An APU fuel pump supplies APU for fuel when pressure is low

22
Q

How long does full refueling take?

A

17 minutes for wing tanks

20 minutes for all tanks

23
Q

What precaution exists from electrical transients during refeuling?

A

The refueling may stop the process so the preselected fuel quantity must be entered

24
Q

What is the refeuling tank heirarchy in auto refueling? Manual refueling?

A

Outer > Inner > Center

Manual: Wing then center then ACT

25
Q

Can the aircraft be refuled with battery power only?

A

Yes

26
Q

When do the refuel valves close automatically?

A

When the preselected refuel value is reached or a high level is sensed

27
Q

What do the XFR valves allow?

A

Fuel transfer between the tanks

Defueling throught the refuel coupling

28
Q

What controls auto refueling and what does that system the transmit?

A

The FQI, it relayes Total fuel mass and temperature to pilots

29
Q

What does the FQI system include?

A

Dual channel system including:

1) FQI Computer
2) Capacitance probes in each tank
3) Densitometer
4) Capacitance Index Compensator
5) Quantity indicator and preselector on the feuling panel

30
Q

What might affect fuel quantity accuracy inflight and by how much?

A

High pitch from climb will cause a fuel discrepancy up to 6 minutes from departure reaching 400kg for low fuel quantities (7tons) and up to one ton with maximum fuel

31
Q

Roles of the FLSCU?

A

1) Fuel level sensor (overflow, low, overflow sensing)

2) Fuel temeprature sensing to control IDG cooling recirculation

32
Q

When does the low level fuel warning come on in each tank?

A

When FLSCU senses level below 750kg (independent FQI)

33
Q

What inputs from ADIRS does the FQI get?

A

A/C attitdue

34
Q

What is the role of the Fuel Tank Inerting System?

A

Reduces fuel tank flamability that have a high flammability exposure by replacing ambient air in tanks with oxygen depleted air. (Less than 12 percent oxygen)

35
Q

What does the FTIS comprise of?

A

Conditioned Service Air System (CSAS)

Inert Gas Generation System (IGGS)

36
Q

What do fault lights indicate on L/R TK Pump pb’s?

A

Low delivery pressure

37
Q

What does the MODE SEL pb do on AUTO? (AO series)

A

Center tank XFR vavles open when inner tank not full

Auto stop automatically after 5min when center tank is low

38
Q

What does fault light on MODE SEL pb mean ?

A

Comes on when center tank has more than 250kg and either wing tanks have less than 5000kg

39
Q

What does TK PUMP pb differ when ON between AN/AO series?

A

AN the pump is only on when center tank delivery pressure goes below a certain threshold

40
Q

What does the MODE SEL pb do on AUTO? (AN series)

A

1) run for 2 min after engine start
2) Pumps run if slats are retracted
3) Stop 5 min after center tank low

41
Q

What does a solid green END light mean on the refueling panel? Flashing?

A

Automatic refueling is done, if flashing means it has been aborted

42
Q

When does the fuel temperature advisory come?

A

Below -40C

Above 45C inner and 50 Outer cells

43
Q

what does it mean if the outer/center tank values are boxed in amber?

A

When transfer valves fail to open when low level is detected in inner tank
When cneter tank transfer valves fail in closed postion

44
Q

When does the inflight advisory come on for fuel tanks imbalance?

A

1500kg difference

45
Q

When does the FOB indication get boxed in amber?

A

When both transfer valves fail closed and low level inner

When center tank pumps fail or OFF

46
Q

What prompts the REFUELG memo?

A

The refueling panel door postion

Z A320 Systems (30 decks)

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