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

PREDICTIVE WINDSHEAR (PWS) DETECTION

The predictive windshear feature detects the presence of windshear up
to 5 nm 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
provides the crew with Advisory, 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 ACTIVATION
The Windshear mode will automatically be turned on under the following
specific aircraft conditions:
In Air: Below 1,800 ft. AGL
On Ground: Typically oil pressure active and either
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 the ALL mode, and the windshear icon is
overlaid on the weather data. In this case, turbulence information is
also shown, regardless of the position of the Turb Control Switch.
Unless the pilot changes the display settings, the display will return to its
previous state once the windshear event is no longer detected.
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
1,500 ft AGL, the appropriate alert is issued and the icon automatically
appears on the display.
Expanded Operating Instructions
18
IntuVue RDR-4000 Weather Radar Pilot's Guide
ground speed greater than 30 kts or
longitudinal acceleration greater than 0.15g.
D201002000008
Rev 1, December 2014