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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2
Operating Controls
3-16
FSBY (FORCED STANDBY)
FSBY is an automatic, nonselectable radar mode. As an installation
option, the RTA can be wired to the weight–on–wheels (WOW) squat
switch. When wired, the RTA is in the FSBY mode when the aircraft is
on the ground. In FSBY mode, the transmitter and antenna scan are
both inhibited, the display memory is erased, and the FSBY legend is
displayed in the mode field. When in the FSBY mode, pushing the STAB
button four times in three seconds restores normal operation.
NOTE: If a WC–650 Weather Radar Controller is installed, FSBY is
overridden by simultaneously pushing both range arrow
buttons.
The FSBY mode is a safety feature that inhibits the transmitter on the
ground to eliminate the X–band microwave radiation hazard. Refer to
Section 6, Maximum Permissible Exposure Level (MPEL).
WARNING
STANDBY OR FORCED STANDBY MODE MUST BE VERIFIED IN
GROUND OPERATIONS BY THE OPERATOR TO ENSURE
SAFETY FOR GROUND PERSONNEL.
In installations with two radar controllers, it is only necessary to override
forced standby from one controller.
If either controller is returned to standby mode while weight is on
wheels, the system returns to the forced standby mode.
10 GAIN
The GAIN is a single turn rotary control and push/pull switch that is used
to control the receiver gain. When the GAIN switch is pushed, the
system enters the preset, calibrated gain mode. Calibrated gain is the
normal mode and is used for weather avoidance. In calibrated gain, the
rotary portion of the GAIN control does nothing.
When the GAIN switch is pulled out, the system enters the variable
gain mode. Variable gain is useful for additional weather analysis and
for ground mapping. In WX mode, variable gain can increase receiver
sensitivity over the calibrated level to show weak targets or it can
be reduced below the calibrated level to eliminate weak returns.
WARNING
LOW VARIABLE GAIN SETTINGS CAN ELIMINATE HAZARDOUS
TARGETS FROM THE DISPLAY.