Forward Looking Terrain Avoidance; Premature Descent Alerting (Pda) - Garmin GNS 530AW Pilot's Manual & Reference

Forward Looking Terrain Avoidance

The unit will issue terrain alerts not only when the
aircraft altitude is below the terrain elevation but also
when the aircraft is projected to come within minimum
clearance values of the terrain. This alerting, called
Forward Looking Terrain Avoidance (FLTA), is also pro-
vided for obstacles. Any potential impact points will be
depicted on the display.
FLTA Severity Levels
"TERRAIN ADVISORY" advisory—Similarly, an
"OBSTACLE ADVISORY" alert is also provided.
"TERRAIN AHEAD" alert (flashing)—Similarly, an
"OBSTACLE AHEAD'' alert is also provided.
Phase of Flight Level Flight
En Route 700 ft.
Terminal 350 ft.
Approach 150 ft.
Departure 100 ft.
Minimum Terrain Clearance Values

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.
CAUTION — The above annunciation and pop-up
terrain alert are displayed during a PDA alert.
Descending
500 ft.
300 ft.
100 ft.
100 ft.
190-00357-00 Rev G
2 - NAV PAGES
NOTE: During the final approach phase of flight, FLTA
alerts are automatically inhibited when the aircraft is
below 200 feet AGL while within 0.5 NM of the ap-
proach runway or is below 125 feet AGL while within
1.0 NM of the runway.
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
Terrain Alerts
49