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Boeing 787 > Fuel System > Flashcards

Fuel System Flashcards

0
Q

Where are the fuel quantities displayed?

A

EICAS and Fuel synoptic

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1
Q

Where is the fuel temperature displayed?

A

EICAS and Fuel synoptic display. Synoptic also shows fuel minimum temperature.

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2
Q

Do the centre pumps produce the same pressure as the main tank pumps?

A

Override/Jettison pumps in centre tank have a higher output pressure.

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3
Q

With all tanks full and all pumps operating, which tank supplies the engines?

A

Centre tank

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4
Q

From which tanks can fuel be jettisoned?

A

All tanks

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5
Q

Where can jettison time be observed?

A

Fuel synoptic display only.

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6
Q

On the ground during start, how many tank pumps will operate with only one electrical power source?

A

Only LEFT AFT fuel pump will operate with APU running. During starting of right engine, RIGHT AFT pump will energize.

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7
Q

What is indicated if the crossfeed switch VALVE light remains illuminated after selection during manual operation?

A

Crossfeed valve is in transit, failed in the shutoff position. Fuel manifolds are not connected.

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8
Q

Where can the fuel freezing temperature be entered?

A

CDU, “PERF INIT” page

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9
Q

What will happen as actual fuel temperature approaches the preset fuel freeze temperature?

A

EICAS indication and indication on fuel synoptic page turns amber.

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10
Q

Is the engine or aircraft operation affected with a tank pump OFF?

A

No, a single pump is sufficient to operate the engine under all conditions.

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11
Q

If a main tank fuel pump fails, will selecting the pump switch off remove the EICAS message and pump PRESS light?

A

No

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12
Q

Which tank is the DC fuel pump in?

A

Left main tank

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13
Q

When does the DC fuel pump operate?

A

With the APU switch on and no AC power available.

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14
Q

If operating, what will cause automatic shutdown of the DC fuel pump?

A

When AC power becomes available.

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15
Q

Can the jettison nozzles be operated on the ground?

A

No, only in flight

16
Q

Can all the main and centre tank fuel be jettisoned?

A

No, at least 3900kg of fuel will remain in each main tank after fuel jettison.

17
Q

What condition generates a FMC “Fuel Disagree” message?

A

When there is a discrepancy between the totalizer fuel quantity and the FMC calculated fuel quantity.

18
Q

In which tank is fuel temperature measured?

A

Measured in all tanks.

19
Q

When are the expanded fuel indications shown on EICAS?

A
  • Crossfeed valve open
  • One or more quantity indicators inop
  • “FUEL IN CENTER”
  • “FUEL LOW CENTER”
  • “FUEL QTY LOW”
  • ”INSUFFICIENT FUEL”
  • ”FUEL FLOW ENG”
  • “FUEL IMBALANCE”
  • Airplane on the ground with both engines off
  • Balance system is active
  • Balance system selected on and fuel is already balanced
20
Q

Where do the surge tanks drain to?

A

Respective main tank

21
Q

When are the center fuel pump PRESS lights illuminated?

A

With low pump output pressure with the switch selected ON

22
Q

When is the fuel scavenge system activated?

A

When either main tank is below 16.000kg and the center fuel pumps are off.

23
Q

When is the fuel scavenge system inhibited?

A

If an engine is on suction feed.

24
Q

Can the engine operate with no corresponding fuel pump providing pressure?

A

Yes, through suction feed. May result in thrust deterioration or flameout due to dissolved air at high altitude.

25
Q

Is it necessary to turn the fuel balancing switch off to stop the fuel balancing?

A

No, fuel balance system will automatically shut off when fuel is balanced within 100kg.

26
Q

What does EICAS “FUEL BALANCE SYS” and FAULT light on the switch indicate?

A

Anytime the system is selected ON and balance is not achieved.

  • System fault or
  • System inhibit
27
Q

When is the fuel balance system inhibited?

A
  • Refueling, Defueling and ground transfer of fuel (using the refueling control panel)
  • On the ground with one/two engines running
  • Fuel balance system failed
  • Either center tank pump is on
  • In flight with fuel jettison system active
  • “FUEL DISAGREE” or “FUEL QTY LOW” messages showing
28
Q

What is the total fuel capacity?

A

101.330 kg

29
Q

Where is the TO REMAIN quantity displayed?

A

On the EICAS, replacing the SAT and fuel temperature indications.

30
Q

What are the tank capacities?

A

787-8
L - 16.929kg C - 67.472kg R - 16.929 kg
787-9
L - 16.776kg C - 67.899kg R - 16.776 kg

31
Q

What is the indication of fuel balancing complete?

A

FUEL BALANCED flashes for 5 seconds on the expanded fuel quantity display.

32
Q

When is a solid WHITE imbalance pointer shown?

A
  • Balance system on or crossfeed open, and
  • Main tank fuel differs by more than 100kg, and
  • “FUEL IMBALANCE” message is NOT shown
33
Q

What is the TO REMAIN quantity automatically set to when arming fuel jettison switch?

A

A quantity that leaves the airplane at Max Landing Weight.

Boeing 787 (18 decks)

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