Garmin GNS 400W Pilot's Manual & Reference

Also see for 400W Series: Supplemental Flight manual Pilot's guide addendum Manual supplement Pilot's guide addendum Quick reference guide

Contents

Garmin GNS 400W Pilot's Manual & Reference Manual pdf 58 page image

2 - NAV PAGES48 190-00356-00 Rev GPremature Descent Alerting (PDA)The TERRAIN system issues a Premature DescentAlert (PDA) when the system detects that the aircraftis significantly below the normal approach path to arunway.PDA ends when the aircraft is either:• 0.5 NM from the runway thresholdOR• is below an altitude of 125 feet AGL whilewithin1.0 NM of the threshold.CAUTION — The above annunciation and pop-upterrain alert are displayed during a PDA alert.PDA Severity LevelsTERRAIN Failure AlertThe TERRAIN system continually monitorsseveral system-critical items, such as database validity,hardware status, and GPS status. Should the systemdetect a failure, a message is annunciated “TERRAINhas failed”.“TERRAIN has failed” messageTerrain Alerts(EIGHT!BOVE4ERRAIN&EET$ISTANCE&ROM$ESTINATION!IRPORTNM 0$!!LERTING!REA0$!!LERTING!REA2UNWAY4HRESHOLDPremature Descent Alerting (PDA) Threshold