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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Operating Controls
3-26
WARNING
WHEN LOW SETTINGS OF VARIABLE GAIN ARE USED,
HAZARDOUS TARGETS CAN BE ELIMINATED FROM
THE DISPLAY.
In the GMAP mode, variable gain is used to reduce the level of the
typically very strong returns from ground targets.
Minimum gain is with the control at its full ccw position. Gain increases
as the control is rotated in a cw direction from full ccw. At the full cw
position, the gain is at maximum.
The VAR legend annunciates variable gain. Selecting RCT or TGT forces
the system into preset gain. Preset gain is not annunciated.
HIDDEN MODES
The PRIMUS
â
880 has five hidden modes that are summarized as
follows:
D Forced Standby (FSBY) Override
D Roll Offset
D Roll Gain (NOTE)
D Pitch Offset (NOTE)
D Pitch Gain (NOTE).
NOTE: At the time of installation, the programming strap STAB TRIM
ENABLE, determinesif the roll andpitch gain, and pitch offset
adjustment features are available. Consult the aircraft
installation information to determine the installed
configuration.
Forced Standby Override
D Function - Forced standby places the radar in a standby mode
on the ground that prevents the radar from radiating and
therefore, exposing ground personnel to radiation exposure.
This mode is annunciated as FSBY (STBY on EFIS) in systems
where mode annunciations are made.
D Entry Method - Power up aircraft on the ground or land the
aircraft with the radar powered.
D Exit Method - Push the STAB button 4 times within 3 seconds
on radar indicator or on controller.