Garmin Pilatus PC_6 Guide de l'utilisateur Page 288

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Garmin G950 Pilot’s Guide for the Pilatus PC-6
190-00870-00 Rev. B
276
HAZARD AVOIDANCE
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICESINDEX
RADAR SIGNAL REFLECTIVITY
Pr ec i Pi tat io n
Precipitation or objects more dense than water, such as the surface of the earth or solid structures, are
detected by the weather radar. The weather radar does not detect clouds, thunderstorms, or turbulence
directly. It detects precipitation associated with clouds, thunderstorms, and turbulence. The best radar
signal reflectors are raindrops, wet snow, or wet hail. The larger the raindrop, the better the reflectivity. The
size of the precipitation droplet is the most important factor in radar reflectivity. Because large drops in a
small concentrated area are characteristic of a severe thunderstorm, the radar displays the storm as a strong
return. Ice crystals, dry snow, and dry hail have low levels of reflectivity as shown in the illustration, and
often not displayed by the radar. Additionally, a cloud that contains only small raindrops, such as fog or
drizzle, does not reflect enough radar energy to produce a measurable target return.
Figure 6-3 Precipitation Type and Reflectivity
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