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N NOTE
If the radar is on, but in the MAP or TEST mode, and the system
detects a windshear event, the system display will automatically
change to the WX+T mode to display the weather and windshear
icons. The selected range does not change automatically.
1st Edition, 1st Revision
18 Sep 03 4-45
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
Figure 4-49 Windshear Alert and Displays
WINDSHEAR DETECTION REGION
The WXR-2100 MultiScan radar provides 60° windshear coverage (30°
either side of aircraft heading) out to 3 NM for Boeing aircraft and out to
5 NM for Airbus and retrofit aircraft. Coverage varies slightly during the
approach/go-around and takeoff phases of flight.
AIRBUS/RETROFIT AIRCRAFT
WARNING
If a windshear warning alert occurs, the flight crew should follow the
recommended airline/aircraft procedure for Go-Around windshear
avoidance.
Figure 4-50 shows the windshear detection coverage for Airbus aircraft
and aircraft that are retrofitted (Airbus and Boeing) with the WXR-2100
MultiScan radar.
1st Edition, 1st Revision
4-46 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
Figure 4-50 Airbus/Retrofit Windshear Detection Coverage
1st Edition, 1st Revision
18 Sep 03 4-47
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
WINDSHEAR COVERAGE — BOEING AIRCRAFT
The Boeing “safety package” integrates the Radar, TCAS and TAWS
functions. When implementing the safety package, Boeing chose to
eliminate all windshear advisories. Figure 4-51 shows the windshear
detection region for aircraft that deliver from Boeing.
1st Edition, 1st Revision
4-48 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
Figure 4-51 Boeing Windshear Detection Coverage
1st Edition, 1st Revision
18 Sep 03 4-49
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
WINDSHEAR ALERTS
Windshear Alert Table
Alert
Type
Aural Alert EFIS Visual
Alert
EFIS Icon
Alert
Warning “Windshear
Ahead” or
“Go Around,
Windshear
Ahead”
WINDSHEAR
or W/S AHEAD
or WINDSHEAR
AHEAD
Windshear
Icon*
and Weather
Caution “Monitor Radar
Display”
WINDSHEAR
or W/S AHEAD
or WINDSHEAR
AHEAD
Windshear
Icon*
and Weather
Advisory None None Windshear
Icon*
and Weather
* Windshear Icon – Alternating red and black horizontal arches
indicating the actual location of the Windshear Event (figure
4-49).
N NOTE
If the display is turned off but the WXR-2100 has been automatically
enabled and detects a windshear event, aural and visual alerts will
still be operational. Radar Icons will be displayed on those aircraft
that allow “pop-up” displays.
WINDSHEAR WARNING
A windshear WARNING is generated whenever a detected windshear
event occurs within ± 0.25 NM of the longitudinal axis of the aircraft
and within ± 30° of the aircraft heading. When the aircraft is on the
ground (takeoff roll), the windshear WARNING occurs for windshear
events within 3 NM.
The output for a windshear warning alert consists of the following:
• A windshear icon displayed on the indicator
• AredWINDSHEAR warning message on the EFIS display
1st Edition, 1st Revision
4-50 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
• An aural alert output of a voice-synthesized phrase “WINDSHEAR
AHEAD, WINDSHEAR AHEAD” during takeoff, or “GO-AROUND,
WINDSHEAR AHEAD” during approach (Icon, Message, Audio)
WINDSHEAR CAUTION
A windshear CAUTION is generated whenever a detected windshear
event occurs outside the windshear warning region and within ± 30° of
the aircraft heading and less than 3 NM from the aircraft.
The output for a windshear caution alert consists of the following:
• The windshear icon display
• A yellow WINDSHEAR message on the EFIS display
• An aural alert output of a chime, or an aural alert output of a
voice-synthesized phrase “MONITOR RADAR DISPLAY” (Icon,
Message, Audio)
WINDSHEAR ADVISORY
A windshear ADVISORY is generated whenever a detected windshear
event occurs within an area 3 to 5 miles ahead of the aircraft and within
± 30° of the aircraft heading.
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Collins Weather Radar operator’s guide(19)
