Honeywell Primus 880 Pilot's Manual page 37

PRIMUS 880 Digital Weather Radar System
r
5 TRB (Turbulence Detection)
TRB switch is used to select the turbulence detection mode of
operation. The TRB mode can only be selected if the MODE switch is
in the WX position and the selected range is 50 miles or less. The
weather/turbulence mode is annunciated in the mode field with the
green WX/T legend. Areas of at least moderate turbulence are shown
in soft white.
TURBULENCE CAN ONLY BE DETECTED WITHIN AREAS OF
RAINFALL. THE PRIMUS
SYSTEM DOES NOT DETECT CLEAR AIR TURBULENCE.
UNDETECTED TURBULENCE CAN EXIST WITHIN ANY STORM
CELL. REFER TO SECTION 5, RADAR FACTS, OF THIS GUIDE
FOR ADDITIONAL INFORMATION.
Selecting the 100--, 200--, or 300--mile range turns off the turbulence
detection. The /T is deleted from the mode annunciation and variable
gain is engaged if previously selected. Subsequent selection of ranges
of 50 miles or less re--engages turbulence detection.
A description of the turbulence detection capabilities and limitations can
be found in Section 5, Radar Facts, of this guide.
6 TILT
The TILT switch is a rotary control used to select tilt angle of antenna
beam with relation to the horizon. CW rotation tilts beam upward to
+15_; ccw rotation tilts beam downward to --15_.
A digital readout of the antenna tilt angle is displayed on the EFIS.
PULL ACT (Altitude Compensated Tilt) Function -- When the
D
TILT control knob is pulled out, the system engages the ACT
(option). In ACT, the antenna tilt is automatically adjusted with
regard to the selected range and barometric altitude. The antenna
tilt automatically readjusts with changes in altitude and/or selected
range. In ACT, the tilt control can fine tune the tilt setting by ±2°.
ACT is annunciated with an A following the digital tilt legend. The
digital tilt readout always shows the commanded tilt of the antenna
regardless of the tilt command source (ACT command or manual tilt
command).
Operating Controls
3-22
CAUTION
880 DIGITAL WEATHER RADAR
R
WARNING
A28- - 1146- - 102- - 03
REV 3