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Copyright © The Boeing Company. See title page for details.
D632W001-TBC
12.10
12.10
1 The FUEL IMBALANCE message may be caused by
an engine fuel leak. For indications of an engine
fuel leak, check:
The total fuel remaining on EICAS compared to
the planned fuel remaining.
The fuel flow displays, for an engine with an
excessive fuel flow.
The individual tank quantities.
The totalizer compared to calculated quantities
(PROGRESS page 2). The TOTALIZER value is
the sum of the individual tank quantities. The
CALCULATED value is the totalizer value at
engine start minus fuel used (calculated using
fuel flow rates and time).
Continued on next page
[] FUEL IMBALANCE
Condition: There is a fuel imbalance between the main
tanks.
Objective: To check for indications of an engine fuel
leak and balance fuel.
December 10, 2007
777 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
D632W001-TBC 12.11
12.11
2 Choose one:
3 FUEL CROSSFEED switch (either) . . . . . . . . . . On
4 Choose one:
Continued on next page
FUEL IMBALANCE continued
There is an indication of an engine fuel leak:
Go to the Fuel Leak checklist on
page 12.16
There is no indication of an engine fuel leak and
the FUEL DISAGREE message shows:
Go to step 3
Left main tank quantity is low:
L fuel PUMPS FWD and AFT
switches (both) . . . . . . . . . . . . . . . . . Off
This allows fuel from the higher
quantity tank to feed both engines.
Do not accomplish the following checklists:
FUEL PUMP L AFT
FUEL PUMP L FWD
Go to step 7
Right main tank quantity is low:
Go to step 5
December 10, 2007
777 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
D632W001-TBC
12.12
12.12
5 R fuel PUMPS FWD and AFT
switches (both) . . . . . . . . . . . . . . . . . . . . . .Off
This allows fuel from the higher quantity tank to
feed both engines.
6 Do not accomplish the following checklists:
FUEL PUMP R AFT
FUEL PUMP R FWD
7 When fuel balancing is complete:
Fuel PUMPS FWD and AFT
switches (all) . . . . . . . . . . . . . . . . . . . . . .ON
FUEL CROSSFEED switches (both) . . . . . . .Off
[Auxiliary Fuel Tank]
FUEL IMBALANCE continued
FUEL IN AUX
Condition: The auxiliary tank fuel quantity is at the level
where the aux fuel switch must be ON.
FUEL IN CENTER
Condition: The center wing tank fuel quantity is at the
level where the pump switches must be ON.
December 10, 2007
777 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
D632W001-TBC 12.13
12.13
FUEL JETT NOZZLE L, R
Condition: A jettison nozzle valve is not in the
commanded position.
December 10, 2007
777 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
D632W001-TBC
12.14
12.14
1 FUEL JETTISON ARM switch . . . . . . . . . . . ARMED
2 Choose one:
3 FUEL JETTISON NOZZLE
valve switches (both) . . . . . . . . . . . . . . . . . .ON
4 Do not accomplish the following checklists:
FUEL PUMP CENTER L
FUEL PUMP CENTER R
5 When fuel jettison is complete:
FUEL JETTISON NOZZLE
valve switches (both) . . . . . . . . . . . . . . . .Off
FUEL JETTISON ARM switch . . . . . . . . . . . .Off
Fuel Jettison
Condition: Fuel jettison is needed.
FUEL TO REMAIN is acceptable:
Go to step 3
FUEL TO REMAIN must be changed:
FUEL TO REMAIN
selector . . . . . . . . . . . . . . . . . . PULL ON
and set manually
Go to step 3
December 10, 2007
777 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
D632W001-TBC 12.15
12.15
1 Fuel jettison can occur only from the center tank.
2 Do not accomplish the following checklist:
FUEL JETTISON
3 When the center fuel tank is empty or the FUEL TO
REMAIN quantity is reached:
FUEL JETTISON NOZZLE
valve switches (both) . . . . . . . . . . . . . . . . Off
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波音777快速检查单 Quick Reference Handbook QRH(59)
