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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2
Operating Controls
3-12
4 TGT (TARGET)
The TGT switch is an alternate–action, button 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 certain
characteristics is detected in the monitored area, the target alert changes
from the green armed condition to the yellow TGT warning condition. This
annunciation advises the pilot that a potentially hazardous target lies
directly in front and outside of the selected range. When this 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
only be selected in the WX and FP modes.
In order to activate target alert, the target must have the depth and
range characteristics described in table 3–3.
Selected Range
(NM)
Minimum Target
Depth (NM)
Target Range
(NM)
5 5 5–55
10 5 10–60
25 5 25–75
50 5 50–100
100 5 100–150
200 5 200–250
300 N/A N/A
FP (Flight Plan) 5 5–55
WC–660 Controller Target Alert Characteristics
Table 3–3
NOTE: When on the ground, in FSBY mode, pushing STAB
four times in three seconds, overrides forced standby.
5 SECT (SCAN SECTOR)
The SECT switch is an alternate–action button that is used to select
either the normal 12 looks/minute 120_ scan or the faster update 24
looks/minute 60_ sector scan.