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747 systems > FUEL > Flashcards

FUEL Flashcards

1
Q

How many fuel takes does the aircraft have and what are their approximate capacities?

A

Seven tanks.

4.0 / 13.3 / 38.1 / 52.2

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2
Q

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

A

Fuel system management cards (FSMC’s)

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3
Q

Which crossfeed valves are affected by flap extension on the ground?

A

2 and 3

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4
Q

Which fuel pumps are system logic pumps? In other words, which fuel pumps are commanded to turn on and off by system logic during normal operations?

A

Override/jettison pumps 2 &3

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5
Q

Trace the flow of fuel to the engines when there are 7700 kgs or more fuel in the Center Wing Tank from blockout.

A

Flaps t/o range; crossfeed valves 2&3 close. CWT override/jettison pumps prove fuel to Engines 1 and 4. Main pumps 2 and 3 supply their related engines.

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6
Q

Trace the flow of fuel to the engines when there is less than 7700 kgs of fuel in the Center Wing Tank from blockout

A

Flaps in t/o position crossfeed valves 2&3 close. Override/jettison pump 2 supplies engine 1, override/jettison pump 3 supplies engine 4. Main pumps 2 &3 supply their respective engines.

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7
Q

When do the FSMCs open the reserve transfer valves?

A

When main tank 2 or 3 fuel quantity decreases to 18,200kg.

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8
Q

Under what conditions would fuel automatically transfer from Main Tanks 1 and 4 to their adjacent Tanks 2 and 3?

A

Fuel jettison when main tanks 2 or 3 reach 9,072kg remaining.

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9
Q

Can fuel be manually transferred from any tank to another tank?

A
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10
Q

What occurs when Fuel Jettison Switch is selected to either A or B?

A

Fuel temp on EICAS replaced with fuel to remaining quantity indication. The jettison manifold and jettison time display on the fuel synoptic.

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11
Q

Describe how the fuel quantity indication changes upon termination of fuel jettison.

A

Fuel to remain quantity indicator changes from magenta to white and flashes for five seconds.

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12
Q

What occurs when you push either fuel jettison nozzle valve to ON during the QRH fuel jettison procedure?

A

Activates all override/jettison pumps in the tanks containing fuel (pump switches must be on) and opens the required jettison valves. The related jettison nozzle valve also opens.The jettison time is displayed- programmed rates initially then updated by actual rate of change.

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13
Q

What is the source of fuel for the APU?

A

Main tank 2.

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14
Q

In general, how are fuel imbalance situations handled?

A

Opening or closing crossfeed valves and turning on or off fuel pimp switches.

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15
Q

What is the impact on the aircraft of excessive fuel imbalance?

A

Affects C of G
Aerodynamic drag
Fuel economy.

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16
Q

When is an engine on suction feed, and how are suction feed situations corrected?

A

Fuel pressure can be provided from a main tank with operating pumps to another engine by opening the appropriate fuel crossfeed valves.

17
Q

Does the suction feed line go through the main tank fuel pumps?

A

No the suction feed line bypasses the pumps.

18
Q

A single Main Tank Fuel Pump can provide sufficient fuel to how many engines?

A

One at takeoff thrust, two at cruise thrust.

19
Q

A single Main Tank 2 or 3 Override/Jettison Pump can provide sufficient fuel to how many engines?

A

Sufficient fuel to operate two engines at take off and cruise condititons.

20
Q

Can the Main Tank 2 or 3 Override/Jettison Pump operate when the related Main Tank is below 3200 kgs (standpipe level)?

A

No.

21
Q

Fuel tank temperature is measured in which tank?

A

One

22
Q

When does the fuel temperature display on Primary EICAS in amber?

A

At or below -37

23
Q

How is the Center Wing Tank fuel scavenged?

A

CWT fuel is scavenged by four jet pumps, two pumping into each main tank 2 and 3. Scavenging begins when main tank 2 or 3 fuel quantity decreases to approx 27,200kg.

24
Q

What three different conditions will generate a fuel imbalance message on the EICAS?

A

FUEL IMBAL 1-4 1360 KG
FUEL IMBAL 2-3 2720KG,
FUEL IMBALANCE 2720KG longitudinally. (after FUEL TANK/ENG displayed)

25
Q

When does the fuel imbalance message no longer display on the EICAS?

A

When difference is less than 450KG.

26
Q

What does a Crossfeed Valve On with the bar visible indication mean for Crossfeed Valve Switches 2 and 3?

A

Crossfeed valve open when commanded by system logic

27
Q

What does a Crossfeed Valve On with the bar visible indication mean for Crossfeed Valve Switches 1 and 4?

A

Crossfeed valves open.

28
Q

When are Override/Jettison Pumps 2 and 3 displayed in Cyan on the Fuel System Synoptic?

A

Armed for system Logic operation.

747 systems (8 decks)

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