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Cirrus SR2x

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HAZARD AVOIDANCE<br />

SYSTEM<br />

OVERVIEW<br />

FLIGHT<br />

INSTRUMENTS<br />

EIS<br />

AUDIO PANEL<br />

& CNS<br />

The different radar echo intensities are measured in decibels (dB) relative to reflectivity (Z). Weather<br />

radars measure the reflectivity ratio, or the energy reflected back to the radar receiver (designated by the<br />

letter Z). The value of Z increases as the returned signal strength increases.<br />

Precipitation Limitations<br />

Radar images may have certain limitations:<br />

• Undetermined precipitation types may be displayed as mixed.<br />

• Base reflectivity is sampled at the minimum antenna elevation angle. An individual radar site cannot<br />

depict high altitude storms at close ranges. It has no information about storms directly over the site.<br />

• When zoomed in to a range of 30 nm, each square block on the display represents an area of four square<br />

kilometers.<br />

• The radar beam may overshoot precipitation occuring below the radar beam, which will be undetected.<br />

Block represents<br />

4 km 2<br />

INDEX<br />

AFCS<br />

HAZARD<br />

AVOIDANCE<br />

ADDITIONAL<br />

FEATURES<br />

FLIGHT<br />

MANAGEMENT<br />

APPENDICES<br />

Figure 6-70 Precipitation Weather Product - Zoomed<br />

The following may cause abnormalities in displayed radar images:<br />

• Ground clutter<br />

• Strobes and spurious radar data<br />

• Sun strobes (when the radar antenna points directly at the sun)<br />

• Interference from buildings or mountains, which may cause shadows<br />

• Metallic dust (chaff) from military aircraft, which can cause alterations in radar scans<br />

374<br />

Pilot’s Guide for the <strong>Cirrus</strong> <strong>SR2x</strong> with <strong>Cirrus</strong> Perspective by Garmin<br />

190-00820-11 Rev. A

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