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.
15.20.12 D6-27370-866-EGP
Radio Altitude Based Alerts
AURAL ALERT VISUAL ALERT DESCRIPTION
PULL UP PULL UP on both
attitude indicators
Follows SINK RATE alert if excessive
descent rate continues or increases.
Follows radio altitude based TERRAIN
alert if excessive terrain closure rate
continues and landing gear and/or flaps
are not in landing configuration.
TERRAIN PULL UP on both
attitude indicators
Excessive terrain closure rate.
DON’T SINK PULL UP on both
attitude indicators
Excessive altitude loss after takeoff or
go–around.
GLIDESLOPE BELOW G/S
P–INHIBIT
lights
Deviation below glideslope. Volume and
repetition rate increase as deviation
increases.
Pushing the ground proximity BELOW
G/S P-INHIBIT light cancels or inhibits
the alert below 1,000 feet RA.
SINK RATE PULL UP on both
attitude indicators
Excessive descent rate.
TOO LOW,
FLAPS
PULL UP on both
attitude indicators
Unsafe terrain clearance at low airspeed
with flaps not in a normal landing
position.
Pushing the ground proximity flap
inhibit switch to FLAP INHIBIT inhibits
the alert.
TOO LOW,
GEAR
PULL UP on both
attitude indicators
Unsafe terrain clearance at low airspeed
with landing gear not down.
Pushing the ground proximity gear
inhibit switch to GEAR INHIBIT
inhibits the alert.
September 25, 2014
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