Pilot's Guide

190-01255-01 Rev. A

Garmin G1000H

™

Pilot’s Guide for the Bell 407GX

353

HAZARD AVOIDANCE

•Radar composite reectivity does not provide sufcient information to determine cloud layers or

precipitationcharacteristics(wethailvs.rain).Forexample,itisnotpossibletodistinguishbetweenwet

snow, wet hail, and rain.

•Anindividualradarsitecannotdepicthighaltitudestormsatcloseranges.Ithasnoinformationabout

storms directly over the site.

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

kilometers.

Figure 6-64 Precipitation Data - Zoomed

Block represents

4 km

Thefollowingmaycauseabnormalitiesindisplayedradarimages:

•Groundclutter

•Strobesandspuriousradardata

•Sunstrobes(whentheradarantennapointsdirectlyatthesun)

•Interferencefrombuildingsormountains,whichmaycauseshadows

•Metallicdustfrommilitaryaircraft,whichcancausealterationsinradarscans