User Guide

Garmin G1000 Pilot’s Guide for the Columbia 350/400
190-00552-00 Rev. A6-48
HAZARD AVOIDANCE
PREMATURE DESCENT ALERT (PDA)
A Premature Descent Alert (PDA) is issued when the aircraft is ` below the normal approach path to the
runway. The PDA alert is heard only during a descent to landing. There are three different scenarios when
the PDA is issued:
• No Approach Loaded - PDA alerting begins when the aircraft is within 15 nm of the destination airport. It
ends when the aircraft is either 0.5 nm from the runway threshold or is at an altitude of 125 feet AGL while
within 1 nm of the threshold. During the final descent, the alerting threshold is based on speed, distance,
and other parameters.
• Non-Precision Approach Loaded - PDA alerting begins when the FAF is the active waypoint and the aircraft
is within 15 nm of the destination airport. PDA alerting ends at 0.5 nm from the runway threshold or at an
altitude of 125 feet AGL within 1 nm of the threshold (Figure 6-55).
• ILS Approach Loaded—PDA alerting begins when the FAF is the active waypoint and the aircraft is within
15 nm of the airport. Once the aircraft intercepts the glideslope, PDA will alert the pilot if the aircraft
descends 0.7 degrees below the glideslope. PDA alerting ends 0.5 nm from the runway threshold or at an
altitude of 125 feet AGL while within 1 nm of the threshold (Figure 6-56).
Runway Threshold
Final Approach Fix
200' b
elo
w F
AF A
ltitude
15 nm
C
A
UTION
0.5 nm
Figure 6-55 Non-Precision Approach PDA Alert Threshold
















Figure 6-56 ILS Approach PDA Alert Threshold