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NCR 744 > 12 - Fuel > Flashcards

12 - Fuel Flashcards

1
Q

The fuel flow displayed on the Fuel Synoptic is generated by ______

It __does/does not__ display actual fuel flow

A

valve positions and pump status

does not

(therefore the display may not represent actual system operation)

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2
Q

During jettison operation, where is fuel to remain indicated?

Magenta - indicates _____

White - indicates _____

A

replaces fuel temperature, (below Total Fuel), on Primary EICAS

fuel to remain at completion of jettison

jettison has completed (flashes for five seconds)

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3
Q

Fuel temperature is measured in ______ and displays on primary EICAS

Temperature normally displays in __color__

It displays in __color__ when the fuel temperature is ____

A

main tank 1

white

amber

at or below -37°C

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4
Q

Standpipe level approximately ____ in each tank

A

3,200 kgs

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5
Q

Each main tank contains ___ AC-powered fuel pumps

A single pump supplies sufficient fuel to operate one engine at _____ or two engines at _____

A

two

takeoff thrust

cruise thrust

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6
Q

Main tanks 2 and 3 each contain ___ AC-powered override/jettison pumps.

A single override/jettison pump supplies sufficient fuel to operate ____ engine(s) during ____

A

two

takeoff

cruise

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7
Q

The ___ center wing tank (CWT) fuel pumps are also override/jettison pumps

Together, the CWT pumps ____ 2 and 3 override/jettison pumps and _____ the main pumps so CWT fuel is used before wing tank fuel

A

two

inhibit

override

(one CWT pump alone does not inhibit 2 and 3 override/jettison pumps or override the outboard
main pumps)

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8
Q

CWT fuel is scavenged by an electric pump activated by system logic. The scavenged fuel is pumped into _____

A

main tank 2

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9
Q

When does CWT scavenge pump activate?

A

when a CWT override/jettison pump has low output pressure OR,

main tank 2 or 3 fuel quantity decreases to
approximately 18,200 kgs

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10
Q

When main tank fuel pump pressure is low, engines can _____

At high altitude, thrust deterioration or engine flameout may occur as a result of _____

A

suction feed through a suction feed line that bypasses the pumps

dissolved air released from the fuel in the tank due to the decrease in air pressure

(The dissolved air will eventually deplete after reaching cruise altitude. The engine may be capable of suction feed operation at cruise power)

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11
Q

Fuel Tank Capacities

Center -
2 and 3 Main -
1 and 4 Main -
Reserves -
Total -
A
  1. 2 C
  2. 3 2/3
  3. 6 1/4
  4. 0 R
  5. 0 total
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12
Q

Each reserve tank contains ___ transfer valves

Fuel ______ transfers to the inboard main tanks when main tank 2 or 3 fuel quantity decreases to approximately ____ kgs

A

two

gravity

18.2

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13
Q

Main tank 1 and 4 each contain ___ transfer valve(s)

During fuel jettison, fuel ______ transfers from the outboard main tanks to the inboard main tanks when either main tank 2 or 3 fuel quantity decreases to ______ kgs

A

one

gravity

9.1 kgs

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14
Q

APU fuel is normally supplied from ______

When AC power is available, fuel is supplied by __(pump)__

If AC power is not available _______ supplies fuel to the APU

A

main tank 2

main pump 2 aft

dedicated DC pump in main tank 2

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15
Q

What commands fuel valves open or closed and fuel pumps on or off according to fuel management logic?

A

Fuel system management cards (FSMCs)

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16
Q

With _____ or more fuel in the CWT, both CWT pump switches should be ON

The FSMCs activate override/jettison pumps 2 and 3 when low pressure is detected from either CWT override/jettison pump. The electrical CWT scavenge pump is automatically activated to pump into ____ . The pump is deactivated after _____

A

7,700 kgs

main tank 2

120 minutes, or no pressure, whichever occurs first

17
Q

Override/jettison pumps 2 and 3 are inhibited from operating when pressure is detected from ______

A

both CWT override/jettison pumps

18
Q

The FSMCs close crossfeed valves 2 and 3 when _____ on the ground

With 7,700 kgs or more CWT fuel: ____ pumps provide fuel to engines 1 and 4, and ____ pumps provide fuel to their related engine

A

flaps extend to takeoff position

CWT override/jettison

main tank 2 and 3

19
Q

The FSMCs close crossfeed valves 2 and 3 when _____

With less than 7,700 kgs of fuel in the CWT:
_____ pumps provide fuel to engine 1
_____ pumps provide fuel to engine 4
_____ pumps provide fuel to their related engine

A

flaps extend to takeoff position on the ground

override/jettison 2

override/jettison 3

main tank 2 and 3

20
Q

The FSMCs open crossfeed valves 2 and 3 when _____

CWT pump switches ON ____ pumps provide fuel to all engines

CWT pump switches OFF ____ pumps provide fuel to engines 1 and 2 and ____ pumps provide fuel to engines 3 and 4

A

flaps are out of takeoff setting (10/20)

CWT override/jettison

override/jettison 2

override/jettison 3

21
Q

With no fuel in center wing tank, (and not tank to engine), the FSMCs activate _____

The FSMCs close crossfeed valves 2 and 3 when ____

____ pumps provide fuel to engine 1
____ pumps provide fuel to engine 4
____ pumps provide fuel to their related engine

A

override/jettison pumps 2 and 3

flaps extend to takeoff position on the ground

override/jettison 2
override/jettison 3
main 2 and 3

22
Q

The fuel jettison system allows jettison from which tanks?

When _____ the _____ indication on EICAS is
replaced with the fuel to remain quantity indication.

The jettison manifold and _____ display on the fuel synoptic.

A

all

jettison control system A or B is selected

fuel temperature

jettison time

23
Q

Pushing _____ switch ON activates all override/jettison pumps in tanks containing fuel (pump switches must be ON) and opens the
required jettison valves

The jettison time is initially estimated using preprogrammed rates. The system begins updating
the estimate based on actual fuel quantity rate of change ___ after jettison begins

A

either fuel jettison nozzle valve

90 seconds

24
Q

______ controls fuel balancing between main tanks 2 and 3 as fuel is jettisoned

If fuel balancing is necessary _____
until the tanks are balanced

A

jettison control system

override/jettison pumps in the low tank deactivate

25
Q

Jettison terminates when _____

The fuel to remain quantity indication changes color from ____ to ____ and flashes for ___ seconds

The ____ deactivates all override/jettison pumps

The related FUEL OVRD pump EICAS
messages display until ____

A

total fuel quantity decreases to fuel to remain

magenta / white / 5

jettison control system

jettison selector is OFF

26
Q

FUEL IMBAL 1-4 :

FUEL IMBAL 2-3 :

FUEL IMBALANCE :

A

1,360 kgs

2,720 kgs

2,720 kgs

27
Q

FUEL QTY LOW: Caution Beeper ____ kgs or less in one or more main tanks

A

900

28
Q

FUEL TEMP LOW Advisory: fuel temperature ____ or less

A

-37°C

29
Q

What three things happen when jettison control system A or B is selected?

A

jettison discharge nozzles armed

fuel to remain replaces fuel temperature (below fuel quantity on upper EICAS)

jettison manifold and jettison time are displayed on the fuel synoptic

30
Q

What two things happen when the fuel jettison nozzle valve is pushed on?

A

jettison valve opens

all override/jettison pumps activate in tanks with fuel, (if pump switches are on)

NCR 744 (23 decks)

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