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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2 3-11
Operating Controls
1 RANGE
The RANGE switches are two momentary contact buttons that are used
to select the operating range of the radar (and LSS if installed). The
system permits selection of ranges in WX mode from 5 to 300 NM full
scale. In the flight plan (FPLN) mode, additional ranges of 500 and
1000 miles are permitted. The up arrow selects increasing ranges,
while the down arrow selects decreasing ranges. One–half the
selected range is annunciated at the one–half scale range mark on the
EHSI.
NOTE: Some integrated avionics systems incorporate radar range
with the map display range control on a MFD/ND display.
2 RCT (RAIN ECHO ATTENUATION COMPENSATION
TECHNIQUE REACT))
This switch position turns on RCT.
The REACT circuitry compensates for attenuation of the radar signal
as it passes through rainfall. The cyan field indicates areas where
further compensation is not possible. Any target detected within the
cyan field cannot be calibrated and should be considered dangerous.
All targets in the cyan field are displayed as fourth level precipitation,
magenta.
RCT is a submode of the WX mode and selecting RCT forces the
system to preset gain. When RCT is selected, the RCT legend is
displayed on the EFIS/MFD.
NOTES: 1. REACT’S three functions (attenuation compensation,
cyan field, and forcing targets to magenta) are
switched on and off with the RCT switch.
2. Refer to Section 5, Radar Facts, for a description of
REACT.
3 STAB (STABILIZATION)
The STAB button turns the pitch and roll stability ON and OFF. It is also
used with the hidden modes.
NOTE: Some controllers annunciate OFF when stabilization is OFF.