Manual Weather Analysis Mode (Man): Constant Altitude - Honeywell IntuVue RDR-4000 Pilot's Manual

IntuVue RDR-4000 Weather Radar Pilot's Guide
MANUAL WEATHER ANALYSIS MODE (MAN): CONSTANT
ALTITUDE
Constant altitude mode is an analysis mode that provides a constant
altitude slice throughout the entire 180-degree plan view. It is called
constant altitude because the altitude slice extracted from the memory
is corrected for the earth's curvature. With traditional tilt angle settings
the earth curves away from the beam far from the aircraft making it
difficult to exactly measure the height of a cell. The Constant Altitude
view provides a plan view that represents a thin slice through the
volumetric memory of weather reflectivity data. This view is corrected
for the curvature of the earth (i.e., it is a view at a constant MSL altitude
level).
The altitude slice is selected by the ALT knob on the control panel. The
altitude is selectable between zero and 60,000 ft in 1,000-ft increments.
On activation of the MAN mode, the slice at the current aircraft altitude
(rounded to the nearest 1,000 ft) is chosen. The view does not move up
or down when the aircraft altitude changes. The pilot can quickly
measure the tops of cells without any
calculations. By varying the selected
altitude until a cell just disappears, the
cell height can be directly read from the
display.
060-4492-000 RDR-4000 Technical Operation
Rev 7, February 2015 57