BendixKing IN-862A System RDR-2100 - Manual (Page 47)

Lateral clearance of at least 20 nautical miles is recommended for all
storm cells providing red or magenta level returns.
Note: The NAV MAP mode is disabled during Vertical Profile operation.
A few seconds will normally elapse before the display will paint the Vertical
Profile radar returns. This delay is due to the time it takes the antenna to
move to the selected azimuth position to begin the vertical scan pattern.
Once Vertical Profile is selected, the desired profile position may be
moved left or right in azimuth by pressing and holding the TRK button.
The selected azimuth position (i.e. track line position) is shown on the
upper left corner of the display.
Note: Vertical Profile is most useful in the wings level operation mode.
During a turn, constant adjustment of the track button would be required
to view the same area of a given cell. Roll stabilization is not functional
during Vertical Profile operation; therefore during a roll, the Vertical
Profile slice angle equals the bank angle of the aircraft providing a
skewed Vertical Profile display.
To terminate the Vertical Profile mode and return to horizontal scanning
operation, press the VP button. The radar system will remain in the
same mode (Wx, WxA, MAP or TEST) of operation and same range
scale as it was in Vertical Profile.
If you have completed the above operations in flight on a sunny day as
suggested, you have experienced the simple operation of Vertical Profile
and observed display of ground paint similar to that shown in Figure 5.
The understanding of this very basic presentation is an important key in
interpreting low level weather.
To improve your use and understanding of Vertical Profile, adjust the tilt
angle to ground map a city or mountain. Use the TRK buttons to select
the ground map target, and activate Vertical Profile by pressing the VP
button. Depending on range, altitude and magnitude of the ground
mapped target, the display should now resemble Figure 6. Note the dif-
ferences between Figure 5 and 6. However, at the location of the ground
mapped target the image is still symmetrical. The symmetrical display is
key in distinguishing the differences between ground returns (ground,
cities, and mountains) and low level weather.
Figures 5 through 10A illustrate normal horizontal scan and Vertical
Profile scan examples of various returns from different weather patterns
encountered during actual flights with the RDR 2100.
Note: Cell intensity (color threshold) in VERTICAL PROFILE may appear
different than cell intensity in horizontal mode. The beam passes upward
through varying reflective levels (see chart on page 11). When scanning
horizontally, the level remains constant.
Effective Date: 9/98 RDR 2100 Pilot's Guide: Rev 1
43
VP Operation In-Flight
RDR 2100 PG 3/12/07 3:45 PM Page 43