Honeywell Primus 880 Pilot's Manual page 31

PRIMUSr 880 Digital Weather Radar System
2 TILT
The TILT switch is a rotary control that is used to select the tilt angle of
antenna beam with relation to the horizon. CW rotation tilts beam
upward 0_ to 15_; ccw rotation tilts beam downward 0_ to - 15_. The
range between +5_ and - 5_ is expanded for ease of setting.
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 readout. The
digital tilt readout always shows the commanded tilt of the antenna
regardless of the tilt command source (ACT command or manual tilt
command).
1. TO AVOID FLYING UNDER OR OVER STORMS,
FREQUENTLY SELECT MANUAL TILT TO SCAN BOTH
ABOVE AND BELOW YOUR FLIGHT LEVEL.
2. ALWAYS USE MANUAL TILT FOR WEATHER ANALYSIS.
3 SECT (Scan Sector)
The SECT switch is an alternate- action button that is used to select
either the normal 12 looks/minute 120_ scan or the faster update 24
looks/minute 60_ sector scan.
4 TGT (Target)
The TGT switch is an alternate- action, button that enables and
disables the radar target alert feature. Target alert is selectable in all but
the 300 mile range. When selected, target alert monitors beyond the
selected range and 7.5_ on each side of the aircraft heading. If a return
with certain characteristics is detected in the monitored area, the target
alert changes from the green armed condition to the yellow TGT
warning condition. This annunciation advises the pilot that a potentially
hazardous target lies directly in front and outside of the selected range.
When this warning is received, the pilot should select longer ranges to
view the questionable target. Note that target alert is inactive within the
selected range.
Operating Controls
3-16
WARNINGS
A digital
A28- 1146- 102- 00