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period. When the cooldown period finishes, the APU shuts down.
Shutdown may be monitored on the EICAS status display if AC power is not
available. The Battery switch should remain ON until APU shutdown is complete.
Note: If the Battery switch is positioned OFF prior to completion of the
cooldown period, the APU will shut down immediately.
A complete shutdown sequence with fire detection capability can be assured by
waiting at least 2 minutes after the APU selector is rotated to OFF before placing
the battery switch OFF.
If a limit is exceeded or a fire detected, the APU shuts down immediately.
Between starts TR wait: Battery wait:
1 and 2 1 minute 1 minute
2 and 3 10 minutes 5 minutes
3 and 4 20 minutes 1 minute
4 and 5 20 minutes 20 minutes
5 and 6 20 minutes 1 minute
For additional starts with TR power, wait 20
minutes between each start. For additional starts
with battery power, wait 60 minutes then
alternate between one and 60 minutes for further
starts.
April 01, 2001
747 Operations Manual
Engines, APU Chapter 7
EICAS Messages Section 40
Copyright © The Boeing Company. See title page for details.
D6-30151-425 7.40.1
Engines, APU EICAS Messages
The following EICAS messages can be displayed.
Engine Alert Messages
Message Level Aural Condition
>AUTOSTART
OFF
Advisory Autostart switch OFF.
Message Level Aural Condition
ENG 1, 2, 3, 4
AUTOSTART
Caution Beeper Autostart system has failed to start the
engine, or fault detected in autostart
system.
Message Level Aural Condition
>ENG 1, 2, 3, 4
CONTROL
Advisory EEC system fault present. Inhibited in
flight.
>ENG
CONTROLS
Advisory Three or four EEC systems operating in a
degraded condition and lack complete
redundancy. Inhibited in flight.
ENG1, 2, 3, 4 EEC
MODE
Advisory Engine EEC in alternate control mode.
ENG 1, 2, 3, 4
FAIL
Caution Beeper Engine failure or flameout in flight.
Message Level Aural Condition
ENG 1, 2, 3, 4
FUEL FILT
Advisory An impending fuel filter bypass exists on
the affected engine.
Message Level Aural Condition
ENG 1, 2, 3, 4
FUEL VLV
Advisory Engine fuel valve or fuel spar valve
position disagrees with commanded
position.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
7.40.2 D6-30151-425
Engines, APU -
EICAS Messages
Message Level Aural Condition
ENG IGNITION Advisory Ignition system fails to provide ignition
when Continuous Ignition switch ON.
Message Level Aural Condition
>ENG 1, 2, 3, 4
LIM PROT
Caution Beeper EEC in alternate control mode and
command N1 exceeds maximum rating.
Message Level Aural Condition
ENG 1, 2, 3, 4
LOW IDLE
Advisory Engine idle not in approach setting when
commanded.
Message Level Aural Condition
ENG 1, 2, 3, 4 OIL
FILT
Advisory Engine oil filter contamination
approaching bypass condition.
Message Level Aural Condition
ENG 1, 2, 3, 4 OIL
PRESS
Advisory Oil pressure reaches red line limit.
Message Level Aural Condition
ENG 1, 2, 3, 4 OIL
TEMP
Advisory Oil temperature reaches amber band.
Message Level Aural Condition
ENG 1, 2, 3, 4
REVERSER
Advisory Fault detected in the reverser system.
Message Level Aural Condition
>ENG 1, 2, 3, 4
RPM LIM
Advisory Engine thrust is limited by N2 red line
limit.
April 01, 2001
747 Operations Manual
Engines, APU -
EICAS Messages
Copyright © The Boeing Company. See title page for details.
D6-30151-425 7.40.3
APU Alert Messages
Engine Memo Messages
APU Memo Messages
Message Level Aural Condition
>ENG 1, 2, 3, 4
SHUTDOWN
Caution Engine Fire switch pulled, or engine Fuel
Control switch in CUTOFF. Master
Caution lights do not illuminate.
ENG 1, 2, 3, 4
START VLV
Advisory Start valve position disagrees with
commanded position.
>IDLE
DISAGREE
Advisory One or more engine idle settings disagrees
with idle commanded.
STARTER
CUTOUT 1, 2, 3, 4
Caution Beeper Start valve fails to close.
Message Level Aural Condition
APU Advisory Automatic shutdown of APU with APU
selector ON, or APU N1 RPMexceeds
95% with APU selector OFF.
APU DOOR Advisory APU door not in commanded position.
APU FUEL Advisory APU fuel pressure low.
Message Level Condition
CON IGNITION
ON
　
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