Garmin GNS 430 Pilot's Manual And Reference page 197

Final Approach Fix
Runway Threshold
15 nm
Figure 11-8 Non-Precision Approach PDA Alert Threshold
• Non-Precision Approach Loaded - PDA alerting
begins when the aircraft is within 15 nm of the
destination airport and the aircraft is on the
flight plan path. The threshold for the descent is
computed by algorithms based on varying flight
conditions (Figure 11-8). 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.
Runway Threshold
2 00' bel ow F AF A ltit ude
C AU TI ON
PDA Alert is
0.7 Below Glideslope
15 nm
Figure 11-9 ILS Approach PDA Alert Threshold
GNS 430 Pilot's Guide and Reference
• ILS Approach Loaded - PDA alerting begins when
the aircraft is within 15 nm of the destination
airport and the aircraft is on the flight plan path.
Prior to crossing the FAF, the pilot receives a PDA
alert if the aircraft descends more than 200 feet
below the FAF crossing altitude. Once the aircraft
crosses the FAF and is inbound to the runway,
PDA alerts the pilot if the aircraft descends 0.7°
below the ILS glideslope (Figure 11-9). 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.
Glideslope Intercept
Final Approach Fix
CAUTION
SECTION 11
TERRAIN
200' below FAF Altitude
11-9