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748 > Fuel > Flashcards

Fuel Flashcards

1
Q

Which fuel pump PRESS lights are extinguished when the associated pumps are selected OFF?

A

OJ pumps Centre tank plus Main 2 and 3.

FCOM 1 28.20.1

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2
Q

When does Nitrogen Generating System (NGS) stop operating?

A
  • During engine out operation, or
  • if the equipment cooling selector is in OVED, or
  • if the right bleed air duct is isolated, or
  • if a Cargo Fire Arm Switch is ARMED

FCOM 1 28.20.1

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3
Q

What temperature level causes fuel temp indication to turn Amber and where is it displayed?

A

When fuel temperature is at or below the fuel freeze temperature entered on the PERF INIT page or -37 degrees if temperature not entered.
Indicated on primary EICAS.

FCOM 1 28.20.1

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4
Q

Is it possible to empty all the fuel tanks using fuel jettison operation?

A

No, only down to standpipe.

FCOM 1 28.20.11

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5
Q

What are the differences between Override/Jettison Pumps and Main Boost pumps?

A
  • Higher output pressure and capacity.
  • OJ supplies sufficient fuel to operate 2 engines during takeoff and cruise.
  • Main supplies sufficient fuel to operate one engine during takeoff and cruise.

FCOM 1 27.20.10

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6
Q

What controls main 2 and main 3 OJ pumps and when do they operate automatically?

A
  • Controlled by fuel system management card (FSMC)
  • Automatic When Centre tank off or centre tank low pressure.

FCOM 1 28.20.10

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7
Q

Describe Scavenge pumps fuel transfer operation, number of pumps and when do they operate?

A

Centre tank is scavenged by 4 jet pumps; 2 into each main 2 and main 3.

Begins when main 2 and 3 fuel quantity decreases to 27,200KG and centre tank less than or equal to1600KG.

FCOM 1 28.20.2

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8
Q

How many different fuel transfer valves are installed and what are their functions?

A
  • Main tank 1 transfer (M1 to M2) and Main tank 4 transfer (M4 to M3)
  • Reserve tank 1 transfer (R1 to M1) and Reserve tank 4 transfer (R4 to M4). Each reserve tank contains 2 transfer valves.

FCOM 1 28.20.9

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9
Q

When does the reserve tank fuel transfer start and where does the fuel transfer to?

A

When Main 1 or 4 decreases to 6100KG.

FCOM 1 28.20.9

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10
Q

How many different ways do the aircraft system deliver fuel to the APU and from which tanks?

A 
Normally supplied from Main tank 2.
When AC power is available:
-Main 2 and 3 aft boost pump ON
-Main 3 boost pump is on to prevent tank to tank transfer.
When AC power not available:
-DC pump feeding from Main 2.

FCOM 1 28.20.9

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11
Q

Which crossfeed valves can be automatically controlled and when?

A

FMSC closes crossfeed valves 2 and 3 when flaps extend for takeoff on the ground. (Between Flaps 10 and 20)

FCOM 1 28.20.9

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12
Q

How many FSMC’s are installed and what are their functions?

A

2 installed.

Command fuel valves open or closed and fuel pumps on or off according to fuel management logic.

FCOM 1 28.20.9

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13
Q

What is the purpose of the Main 1 and 4 transfer valves? Are the manually or automatically operated?

A
  • Transfer fuel from outboard main tanks to Inboard main tanks.
  • Automatically Open during jettison when Main 2 or 3 quantity decreases so 21,600KG.

FCOM 1 28.20.9

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14
Q

At what CWT quantity will FUEL OVD CTR L/R message appear (Ground, climb, and cruise)?

A

Ground: CWT quantity 7700KG or more with CWT pump OFF

Cruise: CWT quantity 1800KG or more with CWT pump OFF

FCOM 1 28.30.2

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15
Q

Do the OJ pump switches need to be selected ON for jettison operation?

A

OJ pumps will be activated automatically by selecting Jettison.

FCOM 1 28.20.11

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16
Q

Which tank can be balanced by the fuel jettison operation and how is it done?

A

Balanced between main tanks 2 and 3. Balances by detecting differences between tank quantities and deactivating pump on lesser tank until quantities are equal.

FCOM 1 28.29.12

17
Q

Where and when is “fuel to remain” indication displayed?

A

EICAS

FCOM 1 28.20.11

18
Q

When do the Main 1 and 4 transfer valves open during fuel jettison?

A

When Main 2 or 3 quantity decreases to 21,600KG

FCOM 1 28.20.12

19
Q

What does FUEL TANK/ENGINE EICAS message mean and what are the required actions?

A

Ground: with crossfeed valves 1 and 4 open. In both wings when Inboard tank quantity is equal or less than the sum of the outboard tank and reserve tank plus 500KG

In flight: with crossfeed valves 1 and 4 open. In either wing and Inboard tank quantity is less than or equal to the sum of the respective outboard tank and reserve tank.

Action:

  • Main 2 and 3 OJ pump OFF.
  • Crossfeed valves 1 and 4 closed.

FCOM 1 28.20.10

20
Q

What message appears when calculated fuel and totaliser fuel differs by a significant amount?

A

FUEL DISAGREE

FCOM 1 28.30.1

21
Q

What happens when any tank quantity is below 900KG?

A

FUEL QTY LOW

FCOM 1 28.30.2

22
Q

How is fuel jettison performed?

A

OJ pumps in main tanks 2 and 3 and centre tank pump fuel overboard through jettison nozzles.

FCOM 1 28.20.11

23
Q

How is it possible to jettison fuel out of the outboard main tanks?

A

Open transfer valves.
When Main 2 or 3 tanks decrease to 21,600KG, transfer valves open.

FCOM 1 28.20.12

24
Q

When will fuel jettison terminate and what is displayed?

A

When total fuel quantity matches “fuel to remain” set. “Fuel to remain” changes from magenta to white and flashed for 5 seconds.

FCOM 1 28.20.12

748 (18 decks)

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