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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Operating Controls
3-4
If WX is selected before the initial RTA warmup period is over
(approximately 90 seconds), the white WAIT legend is displayed
in the mode field. In wait mode, the transmitter and antenna scan
are inhibited and the display memory is erased. When the warmup
is complete, the system automatically switches to the WX mode.
The system, in preset gain, is calibrated as listed in table 4-1.
Rainfall Rate
Color
in/hr mm/hr
.04-.16 1-4 Green
.16-.47 4-12 Yellow
.47-2 12-50 Red
> 2 >5 0 Magenta
Rainfall Rate Color Coding
Table 3-1
D GMAP (Ground Mapping) - The GMAP position puts the radar
system in the ground mapping mode. The system is fully
operational and all parameters are set to enhance returns from
ground targets.
NOTE: REACT, TGT, or TURB modes are not selectable in GMAP.
WARNING
WEATHER TYPE TARGETS ARE NOT CALIBRATED WHEN
THE RADAR IS IN THE GMAP MODE. BECAUSE OF THIS, DO
NOT USE THE GMAP MODE FOR WEATHER DETECTION.
As a constant reminder that GMAP is selected, the alphanumerics
are changed to green, the GMAP legend is shown in the mode field,
and the color scheme is changed to cyan, yellow, and magenta.
Cyan represents the least reflective return, yellow is a moderate
return, and magenta is a strong return.
If GMAP is selected before the initial RTA warmup period is
complete, the white WAIT legend is shown in the mode field. In wait
mode, the transmitter and antenna scan are inhibited and the
memory is erased. When the warmup period is complete, the
system automatically switches to the GMAP mode.
D FP (FlightPlan) -The FPposition puts the radarsystem in theflight
plan mode, which clears the screen of radar data so ancillary data
can be displayed. Examples of this data are: