Honeywell SPZ-8000 Pilot's Manual page 262

SPZ--8000 Digital Integrated Flight Control System
UNDETECTED TURBULENCE CAN EXIST WITHIN ANY STORM
CELL.
Selecting the 100, 200, or 300 mile range turns off turbulence detection.
Reselecting ranges of 50 miles or less re--engages turbulence
detection.
A complete description of turbulence detection capabilities can be
found in the PRIMUS
(Honeywell Pub. No. A28--1146--056).
3 GCR (Ground Clutter Reduction) Button
Pushing the GCR button enables and disables the GCR circuitry. When
GCR is selected the GCR annunciator is displayed on the EFIS/MFD.
The GCR circuitry analyzes the radar signals and does not display
returns that most likely have been reflected off the ground. The system
assumes that the tilt has been set to a reasonable value (i.e., selecting
GCR with 15 tilt down does not eliminate the ground return).
1. DO NOT LEAVE THE RADAR IN THE GCR MODE.
2. GCR REMOVES MOST OF THE GROUND TARGETS FROM THE
DISPLAY BUT AT THE SAME TIME IT REMOVES SOME OF THE
WEATHER TARGETS.
EVEN THOUGH THE GCR CIRCUITS REMOVE GROUND
TARGETS FROM THE DISPLAY, THE GROUND IS STILL
PRESENT, BUT IT IS NOT DISPLAYED.
The GCR feature has the following limitations:
It does not remove all of the ground and it removes some of the
D
weather.
It is most effective straight ahead.
D
Its effectiveness is reduced as the antenna scans away from straight
D
ahead.
Ground clutter reduction is only available for ranges of 50 NM or less
and only in the weather mode. Selecting ranges of 100, 200, or 300 NM
or selecting the turbulence detection mode turns off ground clutter
reduction. Subsequently selecting ranges of 50 miles or less
re--engages GCR. The system is automatically put in preset gain when
GCR is selected.
R
PRIMUS 870 Weather Radar
C--4
WARNING
870 Weather Radar System Pilot's Manual
R
WARNINGS
CAUTION
A28--1146--055
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