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PULL UP  PULL UP on both attitude indicators  Follows SINK RATE alert if descent rate becomes severe. 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. 
GLIDE SLOPE  BELOW G/S P–INHIBIT lights  Deviation below glide slope. 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 override 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 override switch to GEAR INHIBIT inhibits the alert. 
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. 

Copyright . The Boeing Company. See title page for details.
June 1, 2003  15.20.13
Warning Systems -System Description 737 Flight Crew Operations Manual

Windshear Alerts
Windshear alerts are available during takeoff, approach, and landing:
.  
The GPWS provides a warning when the airplane is in a windshear.

.  
The weather radar provides alerts for excessive windshear ahead of the
airplane. These are “predictive windshear alerts.”

 

Windshear warnings are accompanied by WINDSHEAR on the attitude indicators and voice aural alerts.
Windshear cautions are accompanied by a voice aural alert.
Windshear alerts are prioritized based on the level of hazard and the required flight crew reaction time. Predictive windshear alerts are inhibited by an actual windshear warning (airplane in windshear), look-ahead terrain alerts, or radio altitude based alerts.
Windshear Warning (Airplane in Windshear)
AURAL ALERT  VISUAL ALERT  DESCRIPTION 
Two–tone siren followed by WINDSHEAR  Red WINDSHEAR on both attitude indicators.  Excessive windshear at the current airplane position detected by GPWS. Enabled below 1,500 feet RA. GPWS Windshear detection begins at rotation. 

Predictive Windshear Alerts
The weather radar uses radar imaging to detect disturbed air prior to entering a windshear.
Note:  The weather radar provides windshear alerts for windshear events containing some level of moisture or particulate matter.
Note:  The weather radar detects microbursts and other windshears with similar characteristics. The weather radar does not provide alerting for all types of windshear. The flight crew must continue to rely on traditional windshear avoidance methods.
Copyright . The Boeing Company. See title page for details.
15.20.14   September 27, 2004

Warning Systems -System Description

AURAL ALERT  VISUAL ALERT  DESCRIPTION 
WINDSHEAR  Red WINDSHEAR  Windshear close to and directly ahead of the 
AHEAD  on both attitude  airplane detected by the weather radar. 
indicators  Enabled during takeoff, below 1,200 feet RA. 
RED windshear symbol on navigation display  Predictive windshear symbol on the navigation display shows windshear position (expanded MAP, center MAP, and expanded 
Red WINDSHEAR  VOR or APP modes only). 
message on 
navigation display 
(all modes) 
GO AROUND,  Red WINDSHEAR  Windshear within 1.5 miles and directly 
WINDSHEAR  on both attitude  ahead of the airplane detected by the weather 
AHEAD  indicators  radar. 
RED windshear  Enabled during approach, below 1,200 feet 
symbol on  RA. 
navigation display  Predictive windshear symbol on the 
Red WINDSHEAR  navigation display shows windshear position 
message on  (expanded MAP, center MAP, and expanded 
navigation display  VOR or APP modes only). 
(all modes) 
MONITOR  RED windshear  Windshear within 3 miles and ahead of the 
　
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本文鏈接地址：737NG機組操作手冊Flight Crew Operations Manual FCOM 3(160)