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• (magenta) – low quantity, or oil differential reached
Engine Vibration Indications
1 Engine Vibration High Band
Displayed (white) – vibration level at which automatic display of vibration
indications occurs.
2 Engine Vibration
Displayed (white) - engine vibration.
3 Engine Vibration Source
Identifies the vibration source being displayed.
Displayed (white) – vibration source with the highest vibration:
• FAN-fanvibration
• LPT - N1 turbine vibration
• N2 - N2 rotor vibration
SECONDARY EICAS DISPLAY
1 12 12 OIL Q 12 12
SECONDARY EICAS DISPLAY
V B
N2 B
17 12 I 07 12
FAN LPT B
2
1
4
3
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
7.11.6 D6-30151-425
Engines, APU -
Secondary Engine Indications
If vibration source BB (broad band vibration) displayed, source is unknown and
average vibration displayed.
4 Engine Vibration Indicator
Displayed (white) – engine vibration.
Crossbleed Start Indications
1 Crossbleed (X-BLD) Start Indication
Indicates crossbleed air is recommended for in-flight start.
Displayed (magenta):
• in-flight start envelope displayed, and
• airspeed lower than for a windmilling start
2 Fuel-on Indicator
Displayed (magenta):
• a Fuel Control switch is in CUTOFF
• minimum N2 RPM at which Fuel Control switch should be moved to
RUN during start

　
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