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ATLAS B744 > FUEL SYSTEM > Flashcards

FUEL SYSTEM Flashcards

1
Q

How many fuel tanks do we have and what are their approximate capacities?

A 
• 7 fuel tanks 
• 1 and 4 mains = 13.2kgseach
• 2 and 3 Mains = 38.1kgs each
• center tank = 52.1 kgs.
• 2 and 3 Reserves = 4.0.kgs. each
• total capacity = 163, 042
   FCOM, VOL 2; 12.20.4
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2
Q

When do the FSMCs open the reserve transfer valves?

A

• When either main tank 2 or 3 fuel quantity decreases to
approximately 18200 kgs.
• Fuel transfers from reserve tanks 2 and 3 to the related main
tank.
FCOM, VOL 2; 12.20.12

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3
Q

Under what conditions would fuel automatically transfer from main tanks 1 and 4 to their adjacent tanks 2 and 3?

A

• During fuel jettison, when either main tank 2 or 3 fuel quantity decreases
to 9072 kgs.
- Transfer will cease when outboard main tanks reach approximately 3200 kgs.

FCOM, VOL 2; 12.20.12

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4
Q

Can fuel be manually transferred from any tank to another tank?

A

• Yes, there is a FUEL XFER MAIN 1&4 switch on the
overhead panel.
• Fuel can transfer from the outboard to the inboard main
tanks, to approximately 3200 kgs remaining in each outboard
main tank.
FCOM, VOL 2; 12.20.12/12.20.6

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5
Q

State what occurs when you select the Fuel Jettison Switch to A or B?

A

• Arms the jettison system,
• Displays preselected fuel to remain, replacing fuel temperature on
primary EICAS display.
• Jettison manifold and jettison time display on the fuel synoptic.

  FCOM, VOL 2; 12.10.3/ 12.20.16
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6
Q

Describe how the fuel quantity indication changes upon termination of fuel Jettison?

A

• The fuel to remain quantity indication changes from
magenta to white, and
• Flashes for 5 seconds.

FCOM, VOL 2; 12.20.17

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7
Q

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

A

• It activates all override/jettison pumps in the tanks containing fuel,
(pump switches must be on).
• The related jettison nozzle valve opens.

FCOM, VOL 2; 12.20.16

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8
Q

What is the source of fuel for the APU?

A

• Normally supplied from main tank 2.
• When ac power is available, fuel is supplied by main pump 2 aft.
• If AC power is not available, a dedicated DC pump in main tank 2
supplies fuel to the APU.
• Main pump 3 aft operates to prevent tank to tank transfer and
provides fuel if main pump 2 aft fails. ( Backup for AFT pump 2)

FCOM, VOL 2; 12.20.10

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9
Q

In general, how would you handle a fuel imbalance situation?

A 
• By opening or closing crossfeed valves and turning off and on fuel
   pump switches (refer to QRH and Supplementary Procedures)

FCOM, VOL 2; 12.20.3/SP 12.1

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10
Q

What is the impact on the aircraft of excessive fuel imbalance?

A

• Adversely affects CG
• Aerodynamic drag
• Fuel economy
FCOM, VOL 2; 12.20.3

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11
Q

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

A

• An engine is on suction feed when main tank fuel pressure is low.
• Open the appropriate fuel crossfeed valve from a main tank with
operating pumps. ( Caution, continued operation in this configuration
can cause a fuel imbalance.)

FCOM, VOL 2; 12.20.3

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12
Q

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

A

• No, the suction feed line bypasses the pumps

FCOM, VOL 2; 12.20.3

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13
Q

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

A

• One engine at takeoff thrust
• Two engines at cruise thrust.
FCOM, VOL 2; 12.20.2

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14
Q

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

A

• Two engines at takeoff and cruise conditions.

FCOM, VOL 2; 12.20.2

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15
Q

Can the main tank 2 or 3 override/jettison pumps operate when the related Main tank is below 3,200 kgs?(standpipe level)

A

• No

FCOM, VOL 2; 12.20.2

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16
Q

Fuel tank temperature is measured in which tank?

A

• Main tank 1

FCOM, VOL 2; 12.20.1

17
Q

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

A

• -37C

FCOM, VOL 2; 12.20.1

18
Q

How is Center Wing Tank Fuel scavenged?

A

• CWT fuel is scavenged by 4 jet pumps, two pumping into each
main tank 2 and 3.
• Scavenge begins when either main tank 2 or 3 fuel quantity decreases to
approximately 27200 kgs.

FCOM, VOL 2; 12.20.2

19
Q

What are the fuel imbalance differences that would generate an EICAS Advisory message?

A

• 1360 between tanks 1 and 4
• 2720 between tanks 2 and 3
• 2720 between inboard and outboard tanks after FUEL TANK/ENG
FCOM, QRH 12.4/12.6/12.8

20
Q

When correcting a fuel imbalance condition, when would you expect the associated EICAS Advisory IMBAL message to no longer display?

A

• When the difference is less than 450 kgs

FCOM, VOL 2; 12.30.1

21
Q

What does a visible bar indication mean for Crossfeed Valve Switches 2 and 3?

A

• Crossfeed valve open when commanded by system logic.

FCOM, VOL 2; 12.10.1

22
Q

What does a Visible bar indication mean for Crossfeed Valve Switches 1 and 4?

A

• The crossfeed valve is open.

FCOM, VOL 2; 12.10.2

23
Q

What does it mean when the main tank 2 and 3 Override (OVRD) Fuel Pump Switches are ON? How about OFF, ON not visible?

A

• ON – fuel pump operates when commanded by system logic.
• OFF (ON not visible) – fuel pump selected OFF.
FCOM, VOL 2; 12.10.2

24
Q

What is shared flow?

A
  • When CWT drops below 2300kgs,fuel consumption is greater than
    6800 kg/hr, the CWT OJP’s can no longer provide full override of the
    outboard main tank pumps.
  • This sets up a shared flow situation which allows approximately
    900kgs to be used from tanks 1 and 4, prior to EICAS message
    FUEL LOW CENTRE.
25
Q

What is the stand pipe level during override and jettison operation?

A
  • 3200 kgs.
26
Q

In climb, how much fuel in the CWT will activate FUEL LOW CTR L,R?

A
  • Approximately 3200 kgs.
27
Q

Before start with CWT pumps switches ON, what tank quantity will
activate FUEL LOW CTR L,R?

A
  • CWT quantity less than 7700 kgs.
28
Q

In cruise and on the ground, what quantity in the centre tank will bring the advisory message FUEL OVD CTR L,R?

A
  • 1800 kgs or more in the CWT with centre wing tank pump switches OFF.
  • 7700 kgs or more with the centre wing tank pumps OFF.

ATLAS B744 (21 decks)

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