Honeywell Primus 880 Pilot's Manual page 21

PRIMUSr 880 Digital Weather Radar System
FORCED STANDBY MODE MUST BE VERIFIED BY THE OPERATOR
TO ENSURE SAFETY FOR GROUND PERSONNEL.
3 TGT (Target)
The TGT button is an alternate- action switch that enables and
disables the radar target alert feature. Target alert is selectable in all but
the 300- mile range. When selected, target alert monitors beyond the
selected range and 7.5° on each side of the aircraft heading. If a return
with target alert characteristics is detected in the monitored area, the
target alert legend changes from the green T armed condition to the
yellow TGT warning condition. (See the target alert characteristics in
table 3- 2 for a target description.) These annunciations advise the pilot
of potentially hazardous targets directly in front of the aircraft that are
outside the selected range. When a yellow warning is received, the pilot
should select longer ranges to view the questionable target. (Note that
target alert is inactive within the selected range.)
Selecting target alert forces the system to preset gain. Target alert can
be selected only in the WX or FP modes.
NOTE: In order to activate the target alert warning, the target must
have the depth and range characteristics described in table
3- 2.
Operating Controls
3-6
WARNING
A28- 1146- 102- 00