190-00870-02 Rev. A
Garmin G950 Pilot’s Guide for the Pilatus PC-6
295
HAZARD AVOIDANCE
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL
FEA
TURES
APPENDICES
INDEX
MPEL
Boundary
9.16’ for 10” antenna
Figure 6-5 MPEL Boundary
BASIC ANTENNA TILT SETUP
The following discussion is a simple method for setting up the weather radar antenna tilt for most situations.
It is not to be considered an all encompassing setup that works in all situations, but this method does provide
good overall parameters for the monitoring of threats. Ultimately, it is desired to have the antenna tilted so that
the bottom of the radar beam is four degrees below parallel with the ground. The following example explains
one way of achieving this.
With the aircraft flying level, adjust the antenna tilt so ground returns are displayed at a distance that equals
the aircraft’s current altitude (AGL) divided by 1,000. For example, if the aircraft is at 14,000 feet, adjust the
tilt so the front edge of ground returns are displayed at 14 nautical miles. Note this antenna tilt angle setting.
Now, raise the antenna tilt six degrees above this setting. The bottom of the radar beam is now angled down 4º
from parallel with the ground.
PRACTICAL APPLICATION USING THE BASIC TILT SETUP
With the antenna tilt set as previously described, any displayed target return should be scrutinized when
flying at altitudes between 2,000 and 30,000 feet AGL. If the displayed target advances on the screen to
within five nautical miles of the aircraft, avoid it. This may be either weather or ground returns that are 2,000
feet or less below the aircraft. Raising the antenna tilt four degrees can help separate ground returns from
weather returns in relatively flat terrain. This places the bottom of the radar beam parallel with the ground.
Return the antenna tilt to the previous setting after a few sweeps.
