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 15.20.13
Obstacle Alerts
Obstacle display and alerting provides caution and warning level alerts for
man-made obstacles 100 feet and higher.
Runway Awareness and Advisory System (RAAS)
YK995 - YQ456
System Overview
The Runway Awareness and Advisory System (RAAS) is an enhancement to the
GPWS system. RAAS provides aural callouts along with visual alerts on the
Navigation Display (ND) to assist the flight crew with situational awareness
during ground operations, approach to landing, and go-around.
TOO LOW,
TERRAIN
PULL UP on both
attitude indicators
Unsafe terrain clearance at high airspeed
with either landing gear not down or
flaps not in landing position. Follows
DON’T SINK if another descent is
initiated after initial alert, before
climbing to the altitude where the initial
descent began.
Aural Alert Visual Alert Description
OBSTACLE
OBSTACLE,
PULL UP
PULL UP on both
attitude indicators
Red OBSTACLE
message on ND
(all modes)
Solid red terrain
on ND
20 to 30 seconds from projected impact
with obstacle shown solid red on the ND
(in MAP, MAP CTR, VOR, or APP
modes only).
Moving the ground proximity terrain
inhibit switch to TERRAIN INHIBIT
inhibits the alert.
CAUTION
OBSTACLE
Amber
OBSTACLE
message on ND
(all modes)
Solid amber
terrain on ND
40 to 60 seconds from projected impact
with obstacle shown solid amber on the
ND (in MAP, MAP CTR, VOR, or APP
modes only).
Moving the ground proximity terrain
inhibit switch to TERRAIN INHIBIT
inhibits the alert.
AURAL ALERT VISUAL ALERT DESCRIPTION
September 25, 2014
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