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Boeing 757/767 > 757 Fuel Systen > Flashcards

757 Fuel Systen Flashcards

1
Q

What is displayed in the main tank indicator during the fuel quantity test?

A

88.8

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2
Q

The APU is powering the aircraft. Which pump is supplying fuel to the APU?

A

The LEFT FORWARD boost pump

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3
Q

When does the DC fuel boost pump automatically start?

A

When the APU is started with battery power only

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4
Q

At flaps 25. When do the center pump LOW PRESSURE lights illuminate?

A

When the pump switches are on, and pump pressure is low

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5
Q

When does the total fuel value come from?

A

From the fuel quantity processor

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6
Q

There are boxes on the FUEL QUANTITY line of he performance/initialization page. What does this mean?

A

The FMC is not receiving valid fuel quantity data, and the quantity must be manually entered.

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7
Q

He APU is running on the ground. Can you turn off the left forward fuel pump?

A

No… There is an override circuit which keeps the pump operating.

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8
Q

What does the FUEL CONFIG and/or LOW FUEL light mean?

A

Left or right main tank less than 2200 lbs

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9
Q

Fuel temperature is taken from?

A

Sensor in the right main tank

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10
Q

How many fuel pumps per tank?

A

Two AC powered pumps. Left tank has an additional DC pump for APU start when no AC power on the airplane

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11
Q

What is the pump priority?

A

Center tank then main tank. Center tank pumps have a higher output pressure

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12
Q

What happens when a pump has low output pressure?

A

The affiliated switch light “PRESS” light illuminates along with EICAS message

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13
Q

What happens below 50% N3?

A

The center tank pumps are inhibited to reduce electrical loads. Both venter tank pumps are inhibited when engines are shutdown

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14
Q

How is APU FUEL feed controlled?

A

APU is supplied by the left fuel manifold

When APU is turned on and no AC power is available, fuel is provided by a DC pump in the left fuel tank

When AC power is available, the left forward AC fuel pump operates automatically regardless of pump switch position

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15
Q

757 Total fuel capacity

A

75,000 lbs

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16
Q

757 center tank fuel capacity

A

46,000 lbs

17
Q

757 left and right tank fuel capacity

A

14,500 lbs

18
Q

Minimum fuel temperature

A

-45 C

19
Q

Emergency fuel

A

5,000

20
Q

FUEL CONFIG light

A

Left and right tanks differ by 1800

Center tanks switches off with more than 1200 lbs in center tank

Low fuel quantity- LOW FUEL EICAS message

21
Q

FMS CDU FUEL message

A

INSUFFICIENT FUEL - predicted fuel at destination is less than FMC reserve fuel

FUEL DISAGREE PROG 2 - fuel totalizer and calculated fuel quantity disagree

22
Q

How many FUEL EICAS messages are there?

A

13

23
Q

How is unusable fuel in the center tank handled?

A

Center tank fuel scavenge system operates. Transfers fuel to the left main tank.

Begins when the left main tank is approximately half empty

24
Q

What pumps provide fuel to the APU?

A

A dedicated DC pump or the left forward AC fuel pump when AC power is provided

25
Q

What does the fuel totalizer do?

A

It gives an independent calculation

26
Q

On what page of the FMS are the zero fuel wights and reserves entered?

A

PERF INT page

27
Q

On what page of the FMS can totalizer and calculated fuel be found?

A

PROG page 2

28
Q

What is the purpose of the fuel cross feed valves?

A

To enable any pump to feed any engine

29
Q

What 3 conditions will cause the FUEL CONFIG light to illuminate?

A
  1. Fuel in the center tank with the center tank pumps off
  2. Differences between the main tanks
  3. Low fuel in either main tank
30
Q

How is the center tank fuel used before main tank fuel with all pumps on?

A

Center tank pumps have a higher output pressure than the main tank pumps.

31
Q

When do the center tank pumps operate with pump switches on?

A

When the respective engine is operating above 50% N3

32
Q

757 approximate fuel

A

Left main. 14.5
Right main. 14.5
Center. 46.0

Total. 75.0

Boeing 757/767 (5 decks)

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