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VALVE VALVE
ON ON
L-NOZZLE-R
1 & 5
BETWEEN
IN TRANSIT
WITH FLAPS
DO NOT JETT
B
A
OFF
FUEL
JETTISON
December 01, 1999
747 Operations Manual
Fuel Chapter 12
EICAS Messages Section 30
Copyright © The Boeing Company. See title page for details.
D6-30151-425 12.30.1
Fuel System EICAS Messages
The following EICAS messages can be displayed.
Message Level Aural Condition
FUEL IMBAL 1-4 Advisory Fuel difference of 1,360 kilograms
between main tanks 1 and 4. Message no
longer displayed when difference less than
450 kilograms.
FUEL IMBAL 2-3 Advisory Fuel difference of 2,720 kilograms
between main tanks 2 and 3. Message no
longer displayed when difference less than
450 kilograms.
FUEL
IMBALANCE
Advisory Fuel difference of 2,720 kilograms
between inboard main tanks (2 and 3) and
outboard main tanks (1 and 4) after
reaching FUEL TANK/ENG condition.
Message no longer displayed when
difference less than 450 kilograms.
Message Level Aural Condition
>FUEL JETT A, B Advisory Jettison control system has failed.
Inhibited when FUEL JETT SYS message
displayed.
FUEL JETT SYS Caution Beeper Fuel total less than fuel to remain and one
nozzle valve open or both jettison cards
fail.
FUEL OVRD 2, 3
AFT
Advisory Override Pump switch OFF before
tank-to-engine configuration, or low pump
pressure detected with Override Pump
switch ON and pump activated by system
logic.
FUEL OVRD 2, 3
FWD
Advisory Override Pump switch OFF before
tank-to-engine configuration, or low pump
pressure detected with Override Pump
switch ON and pump activated by system
logic.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
12.30.2 D6-30151-425
Fuel -
EICAS Messages
Message Level Aural Condition
FUEL OVRD CTR
L, R
Advisory Center wing tank low pump pressure
detected with the Center Wing Tank Pump
switch ON, or Center Wing Tank Pump
switch OFF and center wing tank fuel
quantity more than 2,700 kilograms.
Message Level Aural Condition
FUEL PMP STAB
L, R
Advisory Stabilizer tank low pump pressure
detected, or low pump pressure detected
with Stabilizer Tank Pump switch ON and
pump activated by system logic, or
Stabilizer Tank Pump switch OFF and
stabilizer tank fuel quantity more than
1,100 kilograms. Inhibited when FUEL
STAB XFER message displayed.
Message Level Aural Condition
FUEL PRESS
ENG 1, 2, 3, 4
Caution Beeper Both main pumps in a tank fail with the
related crossfeed valve closed.
FUEL PUMP 1, 2,
3, 4 AFT
Advisory Main pump has failed. Inhibited when
FUEL PRESS ENG message displayed.
FUEL PUMP 1, 2,
3, 4 FWD
Advisory Main pump has failed. Inhibited when
FUEL PRESS ENG message displayed.
Message Level Aural Condition
FUEL QTY LOW Caution Beeper Fuel quantity in any main tank less than
900 kilograms.
Message Level Aural Condition
FUEL RES XFR 2,
3
Advisory Both reserve tank transfer valves on one
side have failed.
Message Level Aural Condition
FUEL STAB XFR Caution Beeper Horizontal stabilizer fuel fails to transfer.
December 01, 1999
747 Operations Manual
Fuel -
EICAS Messages
Copyright © The Boeing Company. See title page for details.
D6-30151-425 12.30.3
Message Level Aural Condition
>FUEL
TANK/ENG
Advisory Main tank 2 quantity equal to or less than
main tank 1 quantity, or main tank 3
quantity equal to or less than main tank 4
quantity and crossfeed valve 1 or 4 open,
or
on the ground after fueling, initial
electrical power established, or after CMC
ground test, main tank 2 quantity less than
or equal to tank 1 plus 500 kilograms and
tank 3 less than or equal to tank 4 plus 500
kilograms and crossfeed valve 1 or 4 open.
Message Level Aural Condition
>FUEL TEMP
LOW
Advisory Fuel temperature -37°C or less.
FUEL TEMP SYS Advisory Fuel temperature sensing inoperative.
Message Level Aural Condition
FUEL X FEED 1,
2, 3, 4
Advisory Fuel crossfeed valve position disagrees
with commanded position.
>FUEL XFER 1+4 Advisory Fuel Transfer Main 1 & 4 switch ON with
inboard main tank quantities greater than
outboard main tank quantities in flight, or
switch ON while airplane on the ground.
>JETT NOZ ON Advisory Both fuel jettison nozzle valves open.
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