Weather Detection; Automatic Weather Mode (All/All Wx Or On Path/ Path Wx) - Honeywell IntuVue RDR-4000 Pilot's Manual

WEATHER DETECTION

AUTOMATIC WEATHER MODE
(ALL/ALL WX or ON PATH/ PATH WX)
GENERAL DESCRIPTION
The ALL/ALL WX and ON PATH/ PATH WX
modes provide weather, turbulence, and
predictive windshear detection. The system processes the data to fill
the 3D memory and extracts the selected data for display. When a
PWS event is detected, an icon is shown on the display. Returns
determined to be ground clutter are not shown.
Weather targets are color-coded by the intensity of the return. The
display correlation to approximate rainfall (with Gain set to AUTO) is as
follows:
Color Returns
Black Very light or none
Green Light
Yellow Medium
Red Strong
Magenta Turbulence
ON PATH/ PATH WX WEATHER
The RDR-4000 fills the 3D memory with all the detected weather in front
of the aircraft out to 320 nm, and from ground level up to 60,000 ft mean
sea level (MSL). The RDR-4000 displays weather along the flight path
(designated flight path weather) using solid colors. All other weather is
designated as off path weather. When in the ON PATH/ PATH WX
mode, only the on path weather is displayed.
The nominal flight path weather envelope is ±4,000 ft with respect to the
expected flight path. At cruise altitudes above 29,000 ft MSL, the floor
of the envelope is extended down to 25,000 ft MSL when necessary to
ensure that relevant convective activity is displayed. On the ground and
during departure or approach, the ceiling of the envelope is fixed at
10,000 ft MSL. This provides approximately 10 minutes of look-ahead.
Expanded Operating Instructions
12
IntuVue RDR-4000 Weather Radar Pilot's Guide
Reflectivity Color Codes (Gain at AUTO)
Reflectivity
Less than 20 dBZ
20 – 30 dBZ
30 – 40 dBZ
40 dBZ or greater
N/A
Rainfall Rate
Less than 0.7 mm/hr
(0.028 in/hr)
0.7 – 4 mm/hr
(0.028 – 0.16 in/hr)
4 – 12 mm/hr
(0.16 – 0.47 in/hr)
Greater than 12 mm/hr
(0.47 in/hr)
N/A
D201002000008
Rev 1, December 2014