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Atlas Air B747 > Fuel System > Flashcards

Fuel System Flashcards

1
Q

How many fuel tanks on freighter?

A

7 total

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2
Q

Center Tank Capacity?

A

52.1 kg

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3
Q

Main Tanks 2 & 3 Capacity?

A

38.1 kg

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4
Q

Main Tanks 1 & 4 Capacity?

A

13.2

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5
Q

Reserve Tank Capacity?

A

4 kg each

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6
Q

Total Fuel Capacity?

A

163,042 kg

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7
Q

What commands fuel valves and pumps to function?

A

FSMCs

Fuel System Management Cards

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8
Q

Which crossfeed valves are affected by flap extension on the ground?

A

2 & 3

- They are closed by the FSMCs when flaps extend to takeoff position on the ground

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9
Q

Which fuel pumps are commanded to turn ON and OFF by system logic during normal OPS?

A

Overide/Jettison Pumps 2 & 3

- They are inhibited from operating when pressure is detected from both CWT pumps.

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10
Q

With more than 7700 kgs in CWT, trace flow of fuel (for takeoff)?

A
  • Both CWT pump switches should be ON
  • XFEED valves 2 & 3 CLOSE w/flaps set for takeoff
  • CWT pumps feed ENG 1 & 4
  • Main pumps 2 & 3 feed related engine
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11
Q

With less than 7700 kgs in CWT, trace flow of fuel (for takeoff)?

A
  • Both CWT pump switches should be OFF
  • XFEED valves 2 & 3 CLOSE w/flaps set for takeoff
  • O/J Pumps 2 feed ENG 1
  • O/J Pumps 3 feed ENG 4
  • Main Pumps 2 & 3 feed related engine
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12
Q

When do FSMCs open the reserve transfer valves?

A
  • When main tank 2 or 3 quantity decreases to approx 18,200 kgs.
  • Valves OPEN and fuel gravity transfers to main tanks 2 & 3.
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13
Q

When would fuel automatically transfer from main tanks 1 & 4 to their adjacent tanks 2 & 3?

A

During fuel jettison, when either main tank 2 or 3 fuel quantity decreases to 9,072 kgs.

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14
Q

Can fuel be manually transferred from tank to tank?

A
  • Only with the Main Tank 1 & 4 Transfer Switch on the overhead panel.
  • Fuel transfers from outboard to inboard main tanks, until approx 3,200 kgs remain in each outboard tank.
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15
Q

What occurs when we select the Fuel Jettison Switch to A or B?

A
  • Arms the jettison selector

- Display preselected fuel to remain on EICAS

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16
Q

How does fuel quantity indication change upon termination of fuel jettison?

A
  • The fuel to remain quantity indication changes to white & flashes for 5 seconds
17
Q

What occurs when you push either fuel jettison nozzle valve to ON during the QRH fuel jettison procedure?

A
  • Activates all O/J pumps in the tanks containing fuel

- Related jettison nozzle valve OPENS

18
Q

Generally speaking, how do we handle a fuel imbalance?

A

With use of XFEED valves and fuel pump switches

* Refer to QRH

19
Q

How does excessive fuel imbalance impact aircraft?

A
  • Adversely affects CG
  • Aerodynamic drag
  • Fuel Economy
20
Q

When is an engine suction fed and how would you correct a suction feed situation?

A
  • An ENG is on suction feed w/main tank pressure is LOW

- Open appropriate fuel XFEED valve from a main tank with operating pumps.

21
Q

Does the suction feed line go through the main tank fuel pumps?

A

NO, the suction feed line bypasses the pumps

22
Q

A single main tank fuel pump can provide sufficient fuel to how many engines?

A
  • One ENG at takeoff thrust

- Two ENG at cruise thrust

23
Q

A single main tank 2 or 3 O/J pump can provide sufficient fuel to how many engines?

A

Two ENG at takeoff and cruise thrust

24
Q

Can the main tank 2 or 3 O/J pumps operate when the related main tank is below 3,200 kgs?

A

NO

25
Q

Where is fuel tank temp measured?

A

Main Tank 1

26
Q

When does the fuel temp display on primary EICAS display in amber?

A

-37C or less

27
Q

How is CWT fuel scavenged?

A
  • By 4 jet pumps, two pumping into each main tank 2 & 3

- Begins w/ main tank 2 or 3 fuel qty decreases to approx 27,200 kgs

28
Q

Fuel imbalance generated EICAS messages come on?

A

1360 between tanks 1 & 4
2720 between tanks 2 & 3
2720 between inboard & outboard tanks after FUEL TANK/ENG

29
Q

When does IMBAL message on EICAS go away?

A

When difference is less than 450 kgs

30
Q

What does a Crossfeed Valve ON, bar visible, indication mean for Crossfeed Valve Switches 2 & 3?

A

XFEED valve will OPEN per system logic

31
Q

What does a Crossfeed Valve ON, bar visible, indication mean for Crossfeed Valve Switches 1 & 4?

A

XFEED valve is OPEN

32
Q

What does is mean when main tank 2 & 3 OVRD Fuel Pump Switches are ON?

A

Fuel pump operates when commanded by system logic.

33
Q

What is the correct way to reconfigure for FUEL TANK/ENG?

A

O/J Pumps Switches 2 & 3 - OFF

Crossfeed Valve Switches 1 & 4 - OFF

34
Q

Why should we wait until we get a fuel imbalance message before balancing fuel?

A

Because the first step in a fuel imbalance checklist is to determine if a fuel leak exists.

Atlas Air B747 (24 decks)

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