Predictive Windshear (Pws) Detection - Honeywell IntuVue RDR-4000 Pilot's Manual

PREDICTIVE WINDSHEAR (PWS) DETECTION

The Predictive Windshear feature detects the presence of windshear
ahead of the aircraft, giving 10 to 60 seconds of warning before the
encounter. Windshear detection mode operates automatically below
1,800 ft Above Ground Level (AGL), with alerts available at 1,500 ft AGL
and below. If a Windshear event is detected, the system automatically
provides the crew with Caution and/or Warning annunciations, and a
Windshear icon appears on the weather display. This system is meant
to supplement other means of detecting and avoiding hazardous
Windshear conditions. It will not detect all possible hazardous
Windshear conditions such as extremely dry events or events masked
by unusual radar clutter.
AUTOMATIC WINDSHEAR MODE ACTIVATION
The Windshear mode will automatically be turned on under the following
specific aircraft conditions:
In Air:
On Ground: Typically Engine at Take-Off Thrust Setting
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 an
altitude of 1,500 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.
Expanded Operating Instructions
18
IntuVue RDR-4000 Weather Radar Pilot's Guide
Below 1,800 ft. AGL
or both Oil Pressure Active and Transponder On
or the Runway Awareness Advisory System
(RAAS) – if installed, indicates On Runway
060-4492-000
Rev 7, February 2015