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Garmin G1000 Pilot’s Guide for Cessna Nav III190-00498-00 Rev. A
7-43
Premature Descent Alert (PDA)
A Premature Descent Alert is issued when the system
detects that the aircraft is significantly below the normal
approach path to a runway. The PDA alert mode functions
only during descent to land. There are three different
scenarios to consider with PDA:
No Approach Loaded - PDA alerting begins when
the aircraft is within 15 nm of the destination airport
and 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, algorithms will set a threshold
for alerting 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.
Again, algorithms are used to set a threshold for
alerting based upon various parameters. PDA
alerting ends at 0.5 nm from the runway threshold
OR at an altitude of 125 feet AGL while within 1
nm of the threshold.
ILS Approach Loaded—PDA alerting begins when
the FAF is the active waypoint AND the aircraft is
within 15 nm of the destination airport. Prior to
reaching the FAF, a PDA alert will be issued if the
aircraft descends 200 feet below the FAF altitude.
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.
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Runway Threshold
Final Approach Fix
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Figure 7-25 Non-Precision Approach PDA Alert Threshold
Runway Threshold
Final Approach Fix
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PDA Alert is
0.7 Below Glideslope
Glideslope Intercept
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Figure 7-26 ILS Approach PDA Alert Threshold
MULTI FUNCTION DISPLAY
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