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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2 3-7
Operating Controls
The TGT alert mode can be used in the FP mode. With target alert
on and the FP mode selected, the target alert armed annunciation
(green TGT) is displayed. The RTA searches for a hazardous
target from 5 to 55 miles and ±7.5° of the aircraft heading. No radar
targets are displayed. If a hazardous target is detected, the target
alert armed annunciation switches to the alert annunciation (yellow
TGT). This advises the pilot that a hazardous target is in his
flightpath and the WX mode should be selected to view it.
NOTE: The TGT function is inoperative when a checklist is
displayed.
D TST (Test) – The TST position selects the radar test mode. A
special test pattern is displayed to verify system operation. The
TEST legend is shown in the mode field. Refer to Section 4, Normal
Operations, for a description of the test pattern.
WARNING
IN THE TEST MODE THE TRANSMITTER IS ON AND RADIATING
X–BAND MICROWAVE ENERGY. REFER TO SECTION 6,
MAXIMUM PERMISSIBLE EXPOSURE LEVEL (MPEL), AND THE
APPENDIX, FEDERAL AVIATION ADMINISTRATION (FAA)
ADVISORY CIRCULARS, TO PREVENT POSSIBLE HUMAN BODY
DAMAGE.
FSBY (FORCED STANDBY)
FSBY is an automatic, nonselectable radar mode. As an installation
option, the indicator 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, and the forced standby legend is displayed in
the mode field.
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).
When in FSBY mode, you can restore normal operation by pulling the
tilt control out, pushing it in, pulling it out, and pushing it in within three
seconds.
WARNING
STANDBY OR FORCED STANDBY MODE MUST BE VERIFIED
FOR GROUND OPERATION BY THE OPERATOR TO ENSURE
SAFETY FOR GROUND PERSONNEL.