Premature Descent Alerting (Pda); Terrain Failure Alert - Garmin GNS 530W Pilot's Manual & Reference

2 - NAV PAGES
Terrain Alerts

Premature Descent Alerting (PDA)

The TERRAIN system issues a Premature Descent
Alert (PDA) when the system detects that the aircraft
is significantly below the normal approach path to
a runway. PDA begins when the aircraft is within 15
NM of the destination airport. PDA ends when the
aircraft is either 0.5 NM from the runway threshold
or is below an altitude of 125 feet AGL while within
1.0 NM of the threshold.
PDA Severity Levels
CAUTION — The above annunciation and pop-up
terrain alert are displayed during a PDA alert.
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Premature Descent Alerting (PDA) Threshold

TERRAIN Failure Alert

The TERRAIN system continually monitors
several system-critical items, such as database validity,
hardware status, and GPS status. Should the system
detect a failure, a message is annunciated "TERRAIN
has failed".
"TERRAIN has failed" message
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