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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Operating Controls
3-15
The target 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 degrees of dead ahead. No radar
targets are displayed. If a hazardous target is detected, the target alert
armed annunciation switches to the alert annunciation (amber TGT).
This advises the pilot that a hazardous target is in his flightpath and he
should select the WX mode to view it.
NOTE: When displaying checklist, the TGT function is inoperative.
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 displayed in the mode field. Refer to Section 4,
Normal Operations, for a description of the test pattern.
WARNING
UNLESS THE SYSTEM IS IN FORCED STANDBY, THE TRANSMIT-
TER IS ON AND RADIATING X-BAND MICROWAVE ENERGY IN
TEST MODE. REFER TO SECTION 6, MAXIMUM PERMISSIBLE
EXPOSURE LEVEL (MPEL).
D 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, the
display memory is erased, and the FSBY legend is displayed in the
mode field. When in the FSBY mode, pushing the STAB button 4
times in 3 seconds restores normal operation.
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
FORCED STANDBY MODE MUST BE VERIFIED BY THE OPERA-
TOR 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.