737 Flight Crew Operations Manual
Warning Systems -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 15.20.9
Deviation Alerting
When deviating by 300 feet from the selected altitude, a momentary tone sounds
and the current altitude box turns amber and begins to flash. The amber flashing
continues until:
• altitude deviation becomes less than 300 feet
• altitude deviation becomes more than 900 feet
• a new altitude is selected.
Altitude Alert Profile
Ground Proximity Alerts
The GPWS provides alerts for potentially hazardous flight conditions involving
imminent impact with the ground.
+300'
-300'
Acquisition - Aural warning tone momentarily sounds.
NO INDICATIONS
+900'
-900'
SELECTED
ALTITUDE
CAUTION AURAL
CAUTION
AURAL
A box shows around the selected altitude display
Deviation - Aural warning tone momentarily sounds
and current altitude box turns amber and flashes.
and the box around current altitude becomes bold.
ALTITUDE
SEL
September 25, 2014
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