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777 Type Rating > FUEL SYSTEM > Flashcards

FUEL SYSTEM Flashcards

1
Q

Fuel system consists of

A

Centre tank
Two main tanks
Two surge tanks
Fuel x feed connects left and right fuel manifolds through 2 cross feed valves

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2
Q

Fuel pumps

A

Two centre override and jettison pumps
Two additional jettison pumps one in each of left and right tank (used to assist main jettison pumps jettison fuel)
Left and right main tanks contains two AC fuel pumps
Dc pump left main tank feeds fuel to APU

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3
Q

FQIS

A

Height and density to measure fuel quantity in tanks

Temp to measure fuel temp

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4
Q

Pre flight fuel pump panel

A

All pressure lights illuminated except for left forward fuel pump
When AC power is established and APU running the left forward fuel pump operates automatically and the pump pressure light is extinguished indicating the pump is in operation

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5
Q

Pump load shed on centre tank pumps

A

Due only one power source

Displayed as press light underneath

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6
Q

Centre tank pump pressures

A

Higher than main tank

Therefore will override main tank pumps to feed fuel

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7
Q

Fuel burn

A

Fuel burnt from centre tanks first because of higher output pressure
When below a fixed value, fuel low center msg will appear and this indicates pilot to turn off centre tank pump switches in normal ops

Pumps will turn off automatically after 15 seconds of low pressure but the switches must still be turned off

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8
Q

Scavenge pumps

A

Automatically transfer any residual fuel from centre tank to main tanks

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9
Q

Fuel to remain knob operation

A

Pushed in reverts to MLW

Pulled out you can select manually a different value

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10
Q

Jettison fuel

A

Arm
Fuel to remain knob select value, push in for MLW, pull out to manually adjust
Fuel jettison nozzle switches on

Nozzles can not open on the ground

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11
Q

Standpipes

A

Ensure at least 5200kgs of fuel remains in each main tank after fuel jettison is complete

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12
Q

Manually terminate jettison

A

Close both nozzles or

Deselecting the arm switch

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13
Q

How many fuel pumps associated with system

A

Two AC powered fuel pumps, two each tank

Two center tank fuel pumps, they are override and jettison pumps

DC powered pump in left tank
Provides fuel to APU when AC power not available and the APU selector is on

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14
Q

Center pump pressure has and will

A

Higher than L/R main pumps, this is so center tanks can be used before main tanks

Shutoff automatically after 15 seconds of continuous low pressure

Shutoff is inhibited during jettison

Operate only when electrical power sources are available on the ground

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15
Q

How many and purpose of surge tanks

A

One provided in each wing, outboard of each main tank

Fuel in surge tank and fuel remaining in refueling manifold is drained into main tanks

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16
Q

Centre tank scavenge system

A

Uses main tank fuel jettison pumps to transfer the fuel remaining in the centre tank when centre tanks not operating

Inhibited for 45 minutes after the fuel center pump switches are off

Following 45 minutes they operate for a maximum of 4 hours or until the AC is on the ground

17
Q

FUEL IN CENTER EICAS msg

A

Displays when both center fuel pump switches are off with fuel in center tank

18
Q

FUEL LOW CENTER EICAS msg

A

Displays when one or both center pump switches are on and the Center tank quantity is low

19
Q

Fuel crossfeed system

A

Valves closed during normal operations

Closed crossfeed valves isolate the left and right systems

Either valve can be opened to feed an engine from the opposite fuel tank

20
Q

FUEL CROSSFEED FWD OR AFT EICAS Msg

A

Valve position does not agree with switch position

Crossfeed light illuminates

21
Q

FUEL IMBALANCE EICAS msg

A

Fuel quantity differs left and right main tanks

22
Q

Fuel balancing is achieved how

A

By opening either crossfeed valve and turning off fuel pump switches for the fuel tank with lowest quantity

23
Q

APU FUEL SUPPLY

A

From the left fuel manifold

APU fuel can be provided by any AC fuel pump supplying fuel to the left fuel manifold or by the left tank DC fuel pump

24
Q

Left AC or DC pump automatic operation

A

With AC power
Left forward AC pump operates automatically regardless of switch position, DC off

In flight the DC pump operates automatically for quick left engine relight with the loss of both engines and all AC power

25
Q

Jettison time

A

Displays in minutes on the fuel synoptic, time increases with an increase in altitude

26
Q

Fuel jettison with AC FWD CG and heavy

A

Fuel is automatically jettisoned from the centre tank first to keep the CG within limits

Main tank jettison pump operation is delayed

27
Q

VH VOZ. OR VHVPH

A

5200kg of fuel remaining in each main tank as a minimum

28
Q

VHVPH

A

3800kg

777 Type Rating (22 decks)

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