Cockpit Reference Guide

Garmin G1000 Pilot’s Guide for the Piper PA-46 Meridian
190-00763-02 Rev. A334
HAZARD AVOIDANCE
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EICAS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICESINDEX
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EICAS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICESINDEX
SAFE OPERATING DISTANCE
The following information establishes a minimum safe distance from the antenna for personnel near
operatingweatherradar.TheminimumsafedistanceisbasedontheFCC’sexposurelimitat9.3to9.5GHzfor
generalpopulation/uncontrolledenvironments,whichis1mW/cm2.SeeAdvisoryCircular20-68Bformore
information on safe distance determination.
MAXIMUM PERMISSIBLE EXPOSURE LEVEL (MPEL)
ThezoneinwhichtheradiationlevelexceedstheUSGovernmentstandardof1mW/cm2isthesemicircular
areaofatleast9.16feetfromthe10-inchantenna.Allpersonnelmustremainoutsideofthiszone.Witha
scanningorrotatingbeam,theaveragedpowerdensityattheMPELboundaryissignicantlyreduced.
MPEL
Boundary
9.16 ft. for 10”
antenna
Figure 6-48 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6degreesabovethissetting.Thebottomoftheradarbeamisnowangleddown4º
from parallel with the ground.