Hawker 800 XP, Pilot Training Manual

Page: 467 / 504

GCR
A button switch used to select the ground clut-
ter reduction (GCR) mode of operation. The
GCR mode is annunciated above the mode
field with the GCR legend. The GCR mode can
only be selected if the FUNCTION switch is
in the WX position and the selected range is
50 miles or less. GCR is an advisory mode
which reduces the display of ground clutter.
Targets remaining on the display are very
probably weather targets.
Do not leave the radar in the GCR
mode.
Even though the GCR circuits re-
move ground targets from the dis-
play, the ground is still present, it is
simply not being displayed.
GCR removes most of the ground
targest from the display, but at the
same time it removes some of the
weather targets.
The GCR feature has the following limita-
tions: It does not remove all of the ground and
it does remove some of the weather. It is most
effective dead ahead and its effectivity is re-
duced as the antenna scans away from dead
ahead. The circuitry assumes reasonable tilt
settings (looking down 15 degrees and turn-
ing on the GCR does not eliminate the ground
return) for proper operation.
WARNING
CAUTION
WARNING
16A-43
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP PILOT TRAINING MANUAL
FlightSafety
international
Minimum
Selected Target Target
Range (NM) Depth (NM) Range (NM)
10 2 10-50
25 4 25-75
50 4 50-100
100 6 100-150
200 6 200-250
300 Inactive
Flight Plan 2 5-55
(FPLN)
TABLE 16A-3. TARGET ALERT TARGET DEPTH AND RANGE CHARACTERISTICS