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limitations and checkride Q's > # 12 Fuel > Flashcards

# 12 Fuel Flashcards

1
Q

What do the three fuel tanks supply?

A

Fuel to the engine and the APU

AOM 12.20.11

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2
Q

How is the fuel quantity measured?

A

Sensors in each tank

AOM 12.20.1

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3
Q

Where are tank quantities and total fuel displayed?

A

FUEL synoptic page

AOM 12.20.1

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4
Q

Due to the unique nature of the 787 composite wing, fuel quantity indications can fluctuate significantly during which circumstances?

A

During high pitch manouvers such as takeoff and go around, especially at low fuel levels

AOM 12.20.1

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5
Q

Where is fuel temperature displayed? Which color?

A

Primary EICAS display
normally displayed in white, displayed in amber when fuel temperature approaches maximum or the fuel freeze temperature entered on the CDU.
Also displayed on the fuel synoptic

AOM 12.20.1

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6
Q

During Jettison, what replaces the EICAS display static air temperature and fuel temperature indications?

A

The TO REMAIN quantity

AOM 12.20.1

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7
Q

How many fuel pumps in each tank?

A

Two AC-powered fuel tanks

AOM 12.20.1

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8
Q

Can a single pump supply sufficient fuel to operate one engine under all conditions?

A

Yes!

AOM 12.20.1

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9
Q

The two center tank fuel pumps are ________pumps

A

Override/ Jettison

AOM 12.20.1

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10
Q

What does override/Jettison pump mean?

A

These pumps have a higher output pressure than the left and right main tank fuel pumps. The center tank pumps override the main tank pumps so that center tank fuel is used before wing tank fuel.

AOM 12.20.1

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11
Q

With less than all engines running, how does the system decide which pumps to operate?

A

Automatically determines best pumps to operate depending on how much electrical power is available.

AOM 12.20.1

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12
Q

What are the indications that a fuel pump has load shed?

A

The pump switch PRESS light is illuminated and the pump is labeled LOAD SHED on the fuel synoptic.

AOM 12.20.2

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13
Q

The left main tank contains a DC powered fuel pump. Can you control it? What is its purpose?

A

It has no controls or indicators other than fuel synoptic page.
It operates automatically to provide fuel to the APU when AC power is not available and the APU selector is ON.

AOM 12.20.2

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14
Q

Where does fuel in the surge tank and fuel remaining in the refueling manifold drain to?

A

main tanks

AOM 12.20.2

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15
Q

What should you select if during start the FUEL IN CENTER message is displayed?

A

turn on the center tank pumps

AOM 12.20.2

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16
Q

What should you do in flight if you get FUEL LOW CENTER message?

A

turn off the center pumps

AOM 12.20.2

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17
Q

If the center pump has low output pressure, what are the indications?

A

the fuel pump switch PRESS light illuminates and the message FUEL PUMP CENTER (L or R) displays

AOM 12.20.2

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18
Q

With the main tank pumps ON, what does the scavenge system do? When does this happen?

A

Automatically transfers any remaining center tank fuel into the main tanks.
Less than 35,000lbs in either main tank and center pumps off

AOM 12.20.2

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19
Q

Does the scavenge system work if the engine is on suction feed?

A

No, it is inhibited.

AOM 12.20.2

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20
Q

What is the suction feed system?

A

When main tank fuel pumps are low, each engine can draw fuel from its main tank through a suction feed line that bypasses the pumps.

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21
Q

What is the problem with the suction feed at high altitude?

A

At high altitudes due to lower pressure, air can collect in the feed line and restrict fuel flow.

Thrust deterioration or engine flameout may occur

AOM 12.20.2

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22
Q

How can fuel pressure be provided from a main tank to with operating fuel pumps to both engines?

A

The cross feed valve.

AOM 12.20.3

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23
Q

What is the position of the crossfeed valve in normal operations?

A

Closed

AOM 12.20.3

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24
Q

What is the indication if the crossed valve position does not agree with the switch position?

A

CROSSED switch VALVE light illuminates and the EICAS advisory message FUEL CROSSFEED displays

AOM 12.20.3

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25
Q

What does the fuel balance system do?

A

Transfers fuel from main tank to main tank.
High tank to low transferred through its defuel/jettison valve to the lower quantity main tank through its inboard refuel valve.

AOM 12.20.3

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26
Q

Does the fuel balance system automatically stop?

A

YES!

AOM 12.20.3

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27
Q

What does the EICAS message “FUEL BALANCE SYS” mean?

A

There is a system failure or if the system is functional but inhibited.

AOM 12.20.3

28
Q

When is fuel balance operation inhibited?

A
  1. refueling, refueling and ground transfer of fuel using the refueling control panel
  2. prior to engine start and the APU is off
  3. the fuel balance system is failed
  4. center tank pump is on
  5. on the ground and one or both engines are running
  6. is in flight and the fuel jettison system is active or the FUEL DISAGREE or FUEL QTY LOW message shows

12.20.4

29
Q

How can fuel balancing be accomplished?

A

Fuel balance system or manual crossfeed

AOM 12.20.4

30
Q

When can fuel balancing be accomplished?

A

Any phase of flight

AOM 12.20.4

31
Q

What is the total pounds of fuel based on 6.7 pounds per US gallon?

A

787-8 223,378lbs
787-9 223,646lbs

AOM 12.20.4-5

32
Q

Where is APU fuel supplied from?

A

By any AC pump supplying fuel to the left manifold or left main DC fuel pump

AOM 12.20.8

33
Q

On the ground, APU switch off and no AC power available, which pump supplies fuel to the APU?

A

DC pump automatically

AOM 12.20.8

34
Q

With AC power available, which fuel pump operates?

A

the left act AC fuel pump automatically

AOM 12.20.8

35
Q

Which tanks does the fuel jettison system allow from?

A

All of them!

AOM 12.20.8

36
Q

How is fuel jettison accomplished?

A

opening the center tank jettison isolation valves and the main tank refuel/isolation valves. Fuel flows into the jettison/refuel manifold and jettisoned overboard via jettison nozzle valve.

AOM 12.20.8

37
Q

Where is jettison nozzle located?

A

Inboard of each aileron.

AOM 12.20.8

38
Q

What does the jettison system automatically set the fuel-to-remain to when the FUEL JETTISON ARM switch is pushed?

A

Maximum Landing Weight

AOM 12.20.8

39
Q

How can you increase or decrease the TO REMAIN quantity?

A

pull and rotate the TO REMAIN selector

AOM 12.20.8

40
Q

What does the jettison system position the defuel/isolation valves to?

A

Automatically based on the selected TO REMAIN quantity.

AOM 12.20.8

41
Q

Can the jettison nozzles open on the ground?

A

No, regardless of position!

AOM 12.20.8

42
Q

When does jettison automatically stop?

A

Just above the FUEL TO REMAIN quantity

AOM 12.20.8

43
Q

What is the minimum amount of fuel that remains in each main tank after jettison is complete?

A

8700 pounds

AOM 12.20.8

44
Q

What does the Nitrogen Generation System (NGS) do?

A

flammability protection in the fuel system.

AOM 12.20.11

45
Q

How does the Nitrogen Generation System (NGS) minimize flammability?

A

displacing fuel vapors in all fuel tanks.

AOM 12.20.11

46
Q

When fuel tank temperatures start to drop, how can you increase TAT?

A

Increase cruise speed
change cruise altitude
change flight route

AOR 12.1.5

47
Q

When the temperature drops to minimum temperature limit, make TAT higher than minimum temperature limit by + ____C. If there are signs of starvation descend to altitude where temperature is minimum temperature limit + ____C

A

+2C
+5C

AOR 12.1.5

48
Q

What does the fuel scavenge system consist of?

A

Fuel scavenge jet pump and the scavenge isolation valve

AOR 12.3.1

49
Q

Where are the fuel scavenge pumps located?

A

each side of the center tank and on both main tank fuel pumps

AOR 12.3.1

50
Q

How is the scavenge pump operated?

A

using motive flow generated by the fuel flow and pressure of the main tank fuel pump

AOR 12.3.1

51
Q

Which requirements must be met for the scavenge pump isolation valve to open?

A
  1. both center tank fuel pumps are set to command OFF or low pressure
  2. main tank fuel pump of the side is ON
  3. the main tank fuel quantity of the side is less than approximetely 34,500lbs

AOR 12.3.2

52
Q

what is the capacity for one fuel scavenge pump unit?

A

5000lbs/h

AOR 12.3.2

53
Q

If both center tank fuel pumps are inactive, how can you utilize the fuel?

A

Via the scavenge pumps

AOR 12.3.2

54
Q

What could happen if the fuel scavenge isolation valve is open due to a malfunction?

A

Fuel may be unintentionally transferred from center tank to main tank.

  • May cause an imbalance
  • May cause leakage from the surge tank at the tip of the wings

AOR 12.3.2

55
Q

What should you confirm prior to any flight that uses the center tank?

A

Confirm that fuel transfer from the center tank to the main tank will not occur, by activating the center fuel pump in the maintenance

AOR 12.3.2

56
Q

What is the maximum allowable fuel imbalance weight for the left and right main tanks?

A

1500-2500lbs depending on the total main tank fuel weight during taxi, takeoff and landing

INFO 002

57
Q

Under which circumstances can flight crews land the aircraft with “FUEL IMBALANCE” message?

A

When there is not enough time to perform fuel balancing

INFO 002

58
Q

Some aircraft have New Fuel Jettison Nozzle. What are the differences between the New and Old?

A

New Nozzles allow Jettison at flaps 20 and 25.
There is a Placard that states either DO NOT JETT AT FLAPS 30 vs. the old nozzle that says DO NOT JETT AT FLAPS 20, 25, 30

INFO 091

59
Q

Which fuel types are prohibited ?

A

JP-4 and Jet B fuels

AOML.3.9

60
Q

What is minimum fuel temperature prior to dispatch?

A

-29 C

AOML.3.9

61
Q

What is minimum fuel temperature in flight ?

A

must be maintained at least -42c, as well as 3c above the freezing point of the fuel being used

AOM L.3.10

62
Q

what is the maximum tank fuel temperature ?

A

49c

AOM L.3.10

63
Q

when must main tanks must be scheduled to be full?

A

when there is fuel in the center tank.

up to 22,000lb may be loaded in the center tank with less than full main tanks provided the weight of the fuel in the center tank plus the actual zero fuel weight does not exceed the maximum zero fuel weight and the center of gravity limits are observed.

AOML.3.10

64
Q

what is maximum weight of fuel in the mains and center tanks?

A

main L or R -39,192lb
center - 157,620 lb

AOML.3.11

65
Q

With no center tank fuel, use main tank-to-engine fuel feed with all operable main tank boost pumps on and the cross feed valves ________. *a crossfeed valve is __________ for minimum fuel operation.

A

closed, open

AOML.3.12

66
Q

With center tank fuel quantity less than or equal to 16,000lbs, what should you do?

A

use main-to-engine fuel feed with all operable main tank boost pumps on and the crossfeed valves closed.

AOML.3.12

limitations and checkride Q's (8 decks)

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