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yupi-s-TiSiTi. > Fuel > Flashcards

Fuel Flashcards

1
Q

The FUEL IMBAL 2-3 EICAS message indicates a ___ pound difference between main tanks 2 and 3.

A

6000

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2
Q

When does the Fuel system management cards (FSMCs) close fuel crossfeed valves 2 and 3 automatically?

A

When flaps extend to the takeoff position on the ground

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3
Q

During preflight, when fuel pump switches are off before engine start and the APU is not running, in which fuel pump are the low pressure lights illuminated?

A

Main tanks 1,2,3,4 both FWD and AFT switches

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4
Q

With a fuel load of 300,000 lbs, which fuel pumps are supplying fuel to the engines during takeoff?

A

Main pumps 2 and 3 provide fuel to their respective engine, CWT override/jettison pumps supply fuel to engines 1 and 4

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5
Q

When AC power is available and the APU running, which fuel pumps operate regardless of switch position?

A

Main pump 2 and 3 AFT

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6
Q

Fuel temperature is measured in which tank?

A

Main tank 1

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7
Q

With a fuel load of 160,000 lbs.
With crossfeed valves 1 & 4 closed.
What EICAS message would be displayed?

A

> X FEED CONFIG

The fuel mass described implies that:
*The maximum fuel Capacity of each of the tanks 1-4 is 28.8 … and the remaining of the 160 are distributed equally in tanks 2-3 , making 51.2 each.
Therefore tanks 1 and 2 are not equal likewise 3 and 4 also not.

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8
Q

The EICAS advisory alert message FUEL IMBALANCE is displayed under what condition?

A

Fuel difference of 6,000 lbs between Inboard main tanks (2 and 3) and outboard main tanks (1 and 4)…
…after reaching…
…FUEL TANK/ENG condition.

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9
Q

How would the crew know Fuel Jettisoning is complete?

A
  • The fuel to remain quantity indication changes color from magenta to white,
    and
  • flashes for five seconds,
    and
  • the related FUEL OVRD pump EICAS messages display until the Fuel Jettison selector is OFF.
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10
Q

During the Before Start flow when would the L&R CWT override/jettison pumps be selected on?

A

With 17,000 pounds or more fuel in the CWT

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11
Q

Which pumps function as fuel jettison pumps?

A

CWT pumps and override pumps 2 and 3

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12
Q

During Fuel Jettison, when do the Main Tank 1 & 4 Transfer Valves open?

A

Either Main Tank 2 or 3 fuel quantity decreases to 20,000 lbs

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13
Q

In cruise, a precautionary shutdown has be accomplished on engine #1. The EICAS advisory message FUEL IMBAL 1-4 appears shortly thereafter. How would the crew properly configure the fuel system to balance fuel?

A
  • Opening crossfeed valves 1 and 4,
  • closing crossfeed valves 2 and 3, and
  • turning off fuel pumps in tank 4.
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14
Q

With CWT tank pumps selected on prior to engine start, during an extended climb the CWT fuel decreases to 7000 lbs. What EICAS message would appear at this time?

A

> FUEL LOW CTR L, R

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15
Q

During climb to initial cruise altitude, the CWT fuel pumps are selected off when the >FUEL LOW CTR L,R EICAS message appears due to the CWT fuel decreasing to 7000 lbs. In this case, when would the crew turn the CWT pumps back on?

A

At cruise and the >FUEL OVD CTR L, R EICAS message appears

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16
Q

With CWT fuel pumps on and providing pressure, what does the cyan color indicate on the fuel synoptic display regarding the override/jettison pumps 2 and 3?

A

Override pumps 2 and 3 are armed for system logic operation

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17
Q

If the fuel FUEL TANK/ENG EICAS message was inadvertently canceled without the crew actually accomplishing the procedure (override pumps 2 and 3 left on and crossfeed valves 1 and 4 open), what would be the next EICAS message displayed?

A

FUEL IMBALANCE

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18
Q

The FUEL IMBAL 1-4 EICAS message indicates a ___ pound difference between main tanks 1 and 4.

A

3000

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19
Q

What is the approximate fuel capacity of main tanks 2 and 3 each?

A

84,000 lbs

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20
Q

On the -400, main tank 2 and 3 contain two AC powered override/jettison pumps which can operate to a standpipe level of approximately how many pounds?

A

7000 pounds remaining in the tank

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21
Q

On the -400 to what level does main tank 2 or 3 fuel quantity have to decrease to before fuel scavenge begins?

A

Approximately 60,000 pounds

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22
Q

How many crossfeed valves are in the fuel manifold?

A

Four

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23
Q

What is the approximate fuel capacity of main tanks 1 and 4 each?

A

29,000 lbs

24
Q

When the
reserve tanks 2 and 3
Start the gravity transfer into
main tanks 2 and 3?

A

When main tanks 2 or 3 reaches 40,000 lbs

25
Q

What is the approximate fuel capacity of the CWT?

A

114,900 lbs

26
Q

If the Fuel Temp Sensor detects a fuel temperature of -37C or below what message will be displayed?

A

FUEL TEMP LOW EICAS Advisory Alert

27
Q

When do crossfeed valves 2 and 3 automatically open?

A

After takeoff, when the flaps are retracted from the takeoff position

28
Q

When do crossfeed valves 2 and 3 automatically close?

A

On the ground, when the flaps are extended to the takeoff position

29
Q

What is the approximate fuel capacity of reserve tanks 2 and 3 each?

A

8,800 lbs

30
Q

What is the standpipe level in main tanks 1 through 4

A

7000 lbs

31
Q

When is the FUEL TANK/ENG EICAS advisory alert message inhibited?

A

When the fuel jettison selector is in the A or B position

32
Q

The EICAS advisory alert message FUEL TANK/ENG is displayed under what condition?

A

Main tank 2 quantity is equal to or less than main tank 1 quantity, or main tank 3 quantity is equal to or less than main tank 4 quantity and crossfeed valves 1 and 4 are open

33
Q

What happens when main fuel tank 2 or 3 fuel quantity decreases to approximately 40,000 pounds?

A

Fuel transfers from reserve fuel tanks 2 and 3 to their related main fuel tank

34
Q

During fuel jettison, what occurs when main tank 2 or 3 fuel quantity decreases to approximately 20,000 pounds?

A

Main tank 1 and 4 transfer valves open

35
Q

The EICAS advisory alert message X FEED CONFIG will display under what conditions?

A

Crossfeed valve 2 or 3 closed and flaps not in takeoff position and crossfeed valve 1 or 4 closed and main tanks not equal

36
Q

On fuel synoptic, pumps are represented by square (switch like).
The color blue (cyan) on Override/ Jettison pumps 2 and 3 indicate what condition?

A

These pumps are:
- Armed for system logic, but
- Are inhibited by pressure from Center Wing Tanks O/J pumps.

obs: has to sense pressure from both CWT pumps to inhibit

37
Q

On fuel synoptic, pumps are represented by square (switch like).
The color GREEN on the pumps indicate what condition?

A

Pump is ON

*obs: switch doesn’t have to be ON (APU uses #2 and #3 AFT Main Tank with switches OFF with AC available)

38
Q

On fuel synoptic, pumps are represented by square (switch like).
The color WHITE on the pumps indicate what condition?

A

Pump is OFF

39
Q

On fuel synoptic, pumps are represented by square (switch like).
The color AMBER on the pumps indicate what condition?

A

Pump pressure is low.

40
Q

Two override/ jettison CWT pumps are capable to supply fuel to operate:

A
  • 2 engines during takeoff
    or
  • 4 engines during cruise operations.
41
Q

CWT has how many scavenge pumps? Do they have any cockpit control?

A

CWT has 4 scavenge pumps,
Without any cockpit control.

42
Q

EICAS advisory message:
>FUEL LOW CTR L, R
Indicates what conditions?
What should be the crew action?

A

Center pumps are ON, and:

  • Before start, CWT has less than 17,000lbs;
  • In Climb, CWT has less than 7,000 lbs;
  • In Cruise, CWT has less than 3,000lbs.

Action: both pumps off.

43
Q

EICAS advisory message:
>FUEL OVD CTR L, R
Indicates what conditions?
What should be the crew action?

A

The CWT pumps are OFF:

  • On ground and CWT has more than 17,000 lbs;
  • In Cruise and the CWT has more than 4,000 lbs.

ACTION: turn the pumps ON.

44
Q

EICAS Caution Alert message and beeper:
FUEL PRESS CTR L, R
Indicates what conditions?

Action by QRH…

A

Indicates that the respective pump pressure is low. message is shown for 60 seconds

ACTION: (QRH 12.12)
- CTR pump switch (affected side) ………….OFF

45
Q

FUEL MANAGEMENT:

CWT fuel reaches 7,000 lbs during climb.
What EICAS message to expect? And what crew action is required?

A

>FUEL LOW CTR L, R

Action: turn OFF both CWT pumps.

obs: 2 & 3 O/J pumps are no longer inhibited.
And they are now supplying fuel for all 4 engines.

46
Q

FUEL MANAGEMENT

CWT fuel has more than 4,000 lbs in cruise.
What EICAS message to expect? And what crew action is required?

A

>FUEL OVD CTR L, R

Action: turn ON both CWT pumps.

47
Q

FUEL MANAGEMENT

CWT fuel has reaches 3,000 lbs or less in cruise.
What EICAS message to expect? And what crew action is required?

A

>FUEL LOW CTR L, R

Action: Turn OFF both CWT pumps.

48
Q

FUEL MANAGEMENT LOGIC

What happens when the main tanks 2 & 3 reach 60,000 lbs of fuel each?

A
  • CWT fuel is scavenged by 4 jet pumps (hydro mechanical) into tanks 2 & 3.
    At a rate of 1,200 lbs/hr.

No controls, no synoptic.

49
Q

FUEL MANAGEMENT LOGIC

What happens when the main tanks 2 & 3 reach 40,000 lbs of fuel each?

A
  • Fuel transfers from Reserve Tanks into related Main TK.

Automatic, no controls.
But! The valves appears on the synoptic by green arrows.

No pumps are involved, fuel is transferred by gravity.

50
Q

FUEL MANAGEMENT LOGIC

What happens when the main tank 2 qty is equal or less then 1
OR
main tank 3 qty is equal or less then 4.
AND
- Crossfeed 1 or 4 are OPEN?

A

EICAS advisory
>FUEL TANK/ENG

Actions:
- Turn OFF OJ pumps 2&3;
- Close X-feed 1&4.

obs: inhibited 10 min after rotation, or, Jettison A or B

EICAS message is “tied” to crossfeed valves

51
Q

(Longitudinal) FUEL IMBALANCE displays if:

A

There’s a difference of 6,000 pounds between : -
Main tanks 2&3 (together)
Versus
Main tanks 1&4 (together)

i.e.:

52
Q

Fuel balancing procedure is not in the QRH !!!
So where we can find this procedure?

A

AOM - Supplemental Section
04.12.01.01

53
Q

FUEL JETTISON
Selector
- A
- B

A
  • Arms system
  • Fuel to remain replce temp
  • Fuel to remain Knob active
  • > FUEL TANK/ ENG inhibited
  • Imbalance msg inhibited.
  • Synoptic appears white
54
Q

FUEL JETTISON NOZZLE

A
  • Opens the nozzle
  • Activates Jet Pumps
  • Synoptic displays magenta
  • Jettison time on synoptic

-obs 5,000/ min with all jet pumps

55
Q

Fuel Jettison Logic:

A
  • 2&3 = 20,000lbs
    1&4 transfer valves open
    Standpipe 7,000lbs
56
Q

The EICAS advisory message
>X FEED CONFIG
Displays under what logic?

A
  • Xfeed 1-4 closed when tanks are not equal;
    OR
  • Xfeed valves 2-3 closed with flaps UP.

yupi-s-TiSiTi. (24 decks)

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