WX RADAR RDR4000-PILOT GUIDE 气象雷达 RDR4000飞行员指南(7)

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WINDSHEAR ALERT REGIONS 
The PWS mode can generate three types of alerts; Advisory, Caution, and Warning.  These depend on the location of the Windshear event, not the strength.  When a Windshear event is encountered below 1500 ft AGL, the appropriate alert is issued and the icon automatically appears on the display. 
If the display is showing data other than weather (such as ground proximity terrain data) when a Windshear event takes place, the display automatically switches into weather mode for presentation of the Windshear icon.  The Windshear Icon will be overlaid on the radar display indicated by the mode selection knob on the control panel. 
If a Windshear event is encountered while the system is in TEST, the test pattern will be replaced, and the Windshear icon will be overlaid on an AUTO weather display. 
Two different configurations are available for windshear alert regions and windshear alert inhibit regions.  The following pages describe what alerts are shown for each, and how the inhibit regions differ between the two configurations.  The configuration is selected during installation. 
ADVISORY ALERTS 
The Advisory Alert region is ±40° from the aircraft track and from 0.5 nm to 5.0 nm in front of the aircraft.  
. Configuration A: Between 50 ft and 1,500 ft AGL the system indicates ADVISORY Alerts by overlaying the Windshear icon on the radar display.  New Advisory Alerts are inhibited below 50 ft AGL if airspeed is greater than 100 kts on takeoff, or greater than 60 kts on approach.

. Configuration B:  No ADVISORY Alerts are shown.

CAUTION ALERTS 
The Caution Alert region is ±25° from the aircraft track and from 0.5 nm to 3.0 nm in front of the aircraft. 
. Configuration A:  Between 50 ft and 1,200 ft AGL the system indicates CAUTION Alerts with visual and aural annunciations in addition to displaying the Windshear icon(s).  New Caution Alerts are inhibited below 50 ft AGL if airspeed is greater than 100 kts on takeoff, or greater than 60 kts on approach.

. Configuration B:  Between 400 ft and 1,200 ft AGL the system indicates CAUTION Alerts with visual and aural annunciations in addition to displaying the Windshear icon(s).  New Caution Alerts are inhibited below 400 ft AGL if airspeed is greater than 80 kts on takeoff, or greater than 60 kts on approach. 

WARNING ALERTS 
The WARNING Alert region is ±0.25 nm either side of the aircraft track and from 0.5 nm to 1.5 nm (3.0 nm on the ground) in front of the aircraft.  On approach below 370 feet, warnings beyond the far end of the runway are inhibited. 
Between 50 ft and 1,200 ft AGL the system indicates WARNING Alerts with visual and aural annunciations in addition to displaying the Windshear icon.  New Warning Alerts are inhibited below 50 ft AGL if airspeed is greater than 100 kts on takeoff, or greater than 60 kts on approach.
 
TAKE-OFF ALERT REGIONS
 

 
CONFIGURATION A—WINDSHEAR TAKE-OFF
(Includes Advisory Alerts)
 
 

 
CONFIGURATION B—WINDSHEAR TAKE-OFF
(No Advisory Alerts)
 
APPROACH ALERT REGIONS
 

 
CONFIGURATION A—WINDSHEAR APPROACH
(Includes Advisory Alerts)
 
 

 
CONFIGURATION B—WINDSHEAR APPROACH
(No Advisory Alerts)
 
 
 
WINDSHEAR ALERT INHIBIT REGIONS 
The following table compares the Inhibit Regions of Configuration A and Configuration B (selected during installation). 
 
Configuration A
 Configuration B
 
Advisory Alerts are Enabled below 1500 ft.
 No Advisory Alerts
 
　
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