Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

787 Systems > Fuel > Flashcards

Fuel Flashcards

1
Q

What are the capacities of the fuel tanks

A

L Main - 16,900 Kg
R Main - 16,900 Kg
Center - 67,500 Kg

Total - 101,300 KG

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Fuel and Defueling on which side

A

Left side

so cargo can be done on right
(no overwing gravity fueling)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Where are the fuel pumps

A

2 AC pumps in each tank

one DC pump in LT tank for APU without AC power

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Where does the Cross feed move fuel from

A

LT OR RT Main to opposite eng

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

where does the fuel for each eng come from

A

the Center tank cooresponding side pump

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

If no fuel pumps are operating what will happen to the engines

A

nothing, suction feed from the Main tanks will occur

may not work at high altitudes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What pump normally supplies the APU

A

Left Main AFT AC pump

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What does it mean when the PRESS yellow light goes out on the Fuel control panel / Fuel synoptic

A

indicates the pump is operating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What would happen if AC power is not available for APU start

A

DC fuel pump

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

how do you transfer between Main tanks

A

fuel balance system

BALANCE at bottom of the puel control panel

(On grd if both eng shutdown and APU running)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Which fuel pumps are referred to as Override/Jettison pumps

A

Center Tank Pumps

Higher output to ensure center tank fuel is used first

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What flap setting can we not jettison fuel

A
  • 8 FL 20, 25, 30

- 9 FL 30

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Fuel tank Temp limits

A

T/O
-29 deg
+49 deg

In flight
- 42
+65

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the difference in fuel allowed from Main to Center

A

10,000 Kg

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does the PRESS yellow lite mean on Fuel control panel

A

Pump output press is low

switch is off

switch is on but pump output is low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How are the center tank pump switches different

A

Press is inhibited when the switch is off

so only will illuminate PRESS in yellow if switch is on and output press is low

17
Q

What does VALVE in Yellow on the Crossfeed switch mean

A

Valve position is not the same as the switch position

18
Q

Can one center tank feed both engines

A

yes by using the crossfeed

19
Q

How do you know suction feed is happening

A

yellow fuel flow from Main tanks

20
Q

How do you get fuel QTY expanded on EICAS

A

if cross feed or abnormaility in :
pump error
Qty low
imbalance

(check normal EICAS fuel display should appear once eng started prior to T/O)

21
Q

Where is fuel scavenged

A

from Center to Main if center pumps are turned off

22
Q

How do you know a fuel pump has been turned off due to low electric supply

A

Load Shed next to the pump

23
Q

What is NGS

A

Nitrogen Generation System

provides enriched nitrogen pumped into fuel tank to displace fuel vapors

(this reduces fuel flammability)

24
Q

How is fuel balanced on the 787

A

Main Tank inbalance is usually corrected by Balance system through the Jettison Valve

but if not operative use traditional crossfeed systems

(does not use the crossfeed chanels)

25
Q

How can you tell Balancing is happening

A

Switch ON
FUEL BALANCE ON - EICAS
Balance line from Jettison Valve on Synoptic

26
Q

When does the fuel stop balancing

A

< 100 Kg diff

FUEL BALANCE ON FLASHES 5 SEC

Switch goes out

(all automatic)

27
Q

Does the Cross feed transfer fuel from one main tank to the other

A

No, just allows fuel from one main tank to feed both engines

28
Q

When can the automatic fuel balance system be used

A

In flight

Ground with eng off and APU running

29
Q

When is the Automatic Fuel Balancing system inhibited

A

On Grd and APU not runnning

one or both Center tanks operating

Fuel is being Jettisoned

30
Q

Jettison is not availble when

A

on ground

31
Q

Which tanks can be jettison from

A

all tanks

32
Q

Which valves move the fuel to be jettison

A

Main tank Defuel

Center tank isolation valves

33
Q

Where are the Jettison Nozzle valves

A

inboard each aileron

34
Q

What does the TO REMAIN value target

A

MLW

also displayed is the JETT TIME on Fuel synoptic lower right

35
Q

What is the Fuel to remain dial for

A

to adjust the remain quantity from the MLW default

36
Q

Regardless of the TO REMAIN selection what fuel remains in each Main tank after Jettison is complete

A

3,900 Kg in each tank

37
Q

What pumps have to be on to jettison fuel

A

Main and Center tanks

38
Q

What does the VALVE in amber on the Nozzle switch mean

A

not in the commanded position

787 Systems (19 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions