Fuel Flashcards
What are the capacities of the fuel tanks
L Main - 16,900 Kg
R Main - 16,900 Kg
Center - 67,500 Kg
Total - 101,300 KG
Fuel and Defueling on which side
Left side
so cargo can be done on right
(no overwing gravity fueling)
Where are the fuel pumps
2 AC pumps in each tank
one DC pump in LT tank for APU without AC power
Where does the Cross feed move fuel from
LT OR RT Main to opposite eng
where does the fuel for each eng come from
the Center tank cooresponding side pump
If no fuel pumps are operating what will happen to the engines
nothing, suction feed from the Main tanks will occur
may not work at high altitudes
What pump normally supplies the APU
Left Main AFT AC pump
What does it mean when the PRESS yellow light goes out on the Fuel control panel / Fuel synoptic
indicates the pump is operating
What would happen if AC power is not available for APU start
DC fuel pump
how do you transfer between Main tanks
fuel balance system
BALANCE at bottom of the puel control panel
(On grd if both eng shutdown and APU running)
Which fuel pumps are referred to as Override/Jettison pumps
Center Tank Pumps
Higher output to ensure center tank fuel is used first
What flap setting can we not jettison fuel
- 8 FL 20, 25, 30
- 9 FL 30
Fuel tank Temp limits
T/O
-29 deg
+49 deg
In flight
- 42
+65
What is the difference in fuel allowed from Main to Center
10,000 Kg
What does the PRESS yellow lite mean on Fuel control panel
Pump output press is low
switch is off
switch is on but pump output is low
How are the center tank pump switches different
Press is inhibited when the switch is off
so only will illuminate PRESS in yellow if switch is on and output press is low
What does VALVE in Yellow on the Crossfeed switch mean
Valve position is not the same as the switch position
Can one center tank feed both engines
yes by using the crossfeed
How do you know suction feed is happening
yellow fuel flow from Main tanks
How do you get fuel QTY expanded on EICAS
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)
Where is fuel scavenged
from Center to Main if center pumps are turned off
How do you know a fuel pump has been turned off due to low electric supply
Load Shed next to the pump
What is NGS
Nitrogen Generation System
provides enriched nitrogen pumped into fuel tank to displace fuel vapors
(this reduces fuel flammability)
How is fuel balanced on the 787
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)
How can you tell Balancing is happening
Switch ON
FUEL BALANCE ON - EICAS
Balance line from Jettison Valve on Synoptic
When does the fuel stop balancing
< 100 Kg diff
FUEL BALANCE ON FLASHES 5 SEC
Switch goes out
(all automatic)
Does the Cross feed transfer fuel from one main tank to the other
No, just allows fuel from one main tank to feed both engines
When can the automatic fuel balance system be used
In flight
Ground with eng off and APU running
When is the Automatic Fuel Balancing system inhibited
On Grd and APU not runnning
one or both Center tanks operating
Fuel is being Jettisoned
Jettison is not availble when
on ground
Which tanks can be jettison from
all tanks
Which valves move the fuel to be jettison
Main tank Defuel
Center tank isolation valves
Where are the Jettison Nozzle valves
inboard each aileron
What does the TO REMAIN value target
MLW
also displayed is the JETT TIME on Fuel synoptic lower right
What is the Fuel to remain dial for
to adjust the remain quantity from the MLW default
Regardless of the TO REMAIN selection what fuel remains in each Main tank after Jettison is complete
3,900 Kg in each tank
What pumps have to be on to jettison fuel
Main and Center tanks
What does the VALVE in amber on the Nozzle switch mean
not in the commanded position
