Fuel System Flashcards

1
Q

How is the fuel moved from the center tank to the main tanks

A

transfer ejectors

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2
Q

How is the fuel moved from the main tanks to the collector tanks

A

Scavenge ejectors and gravity

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3
Q

How is the fuel moved from the collector tanks to the engine driven high pressure fuel pump

A

Main ejectors
backed up by DC electric boost pumps

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4
Q

What is the function of the electric boost pumps

A

To provide initial fuel for engine start and to back-up the main ejectors when ejector pressure is low

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5
Q

Will an engine continue to run with a failed engine driven fuel pump?

A

No

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6
Q

What is the maximum fuel imbalance

A

300 lbs for takeoff,

800 lbs for all other phases

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7
Q

When will the fuel system automatically begin transferring fuel

A

200 lb fuel imbalance

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8
Q

When are the boost pumps automatically energized

A

Low pressure from the main ejectors

if the pumps are armed

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9
Q

Where is the high pressure fuel pump located

A

N2 accessory gearbox

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10
Q

Where is bulk fuel temperature taken

A

right main tank

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11
Q

What is the Minimum Bulk Fuel Temp for take-off (Jet A)

A

-30°C

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12
Q

What is the minimum bulk fuel temp during flight (Jet A)

A

-40°C

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13
Q

How is engine fuel heated

A

Fuel/oil heat exchanger

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14
Q

What is the minimum engine fuel temperature for takeoff

A

+5°C

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15
Q

What is the takeoff limitation if the center tank has > 500 lbs of fuel

A

Each main (wing) tank must have more than 4400 lbs

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16
Q

Which Bus powers the refuel/defuel panel and refuel/defuel SOVs?

A

APU Battery Direct Bus

17
Q

Where is the refuel/defuel panel located

A

The fuselage forward of right wing

18
Q

Where is the single point adapter located

A

Right wing root

19
Q

When will the auto cross flow system stop tranferring fuel?

A

When the fuel quantity of the low tank exceeds the other tank by 50lbs

20
Q

What message will be displayed on EICAS whenever the refuel/defuel panel is swiched on?

A

AUTO XFLOW INHIB status message