2 - NAV PAGES
48
• Imminent Terrain Impact (ITI) Avoidance
— Pro-
vides alerts when the aircraft is below the eleva-
tion of a terrain cell in the aircraft’s projected path.
ITI alerts are accompanied by a potential impact
point displayed on the TERRAIN Page. The alert
is given when the projected vertical flight path
is calculated to come within minimum clearance
altitudes in the following table.
Phase of Flight
Level Flight
Descending
En Route
700 ft.
500 ft.
Terminal
350 ft.
300 ft.
Approach
150 ft.
100 ft.
Departure
100 ft.
100 ft.
Minimum Terrain Clearance Values for RTC/ITI Alerts
During the final approach phase of flight, RTC/ITI
alerts are automatically inhibited when the aircraft
is below 200 feet AGL while within 0.5 NM of the
approach runway or is below 125 feet AGL while
within 1 NM of the runway threshold.
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.
CAUTION — The above annunciation and pop-up
terrain alert are displayed during a PDA alert.
PDA Severity Levels
Terrain Alerts
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Premature Descent Alerting (PDA) Threshold
Summary of Contents for GNS 430AW
Page 1: ...Pilot s Guide Reference 400W Series ...
Page 10: ...INTRODUCTION viii Blank Page ...
Page 38: ...28 1 COM Blank Page ...
Page 70: ...2 NAV PAGES 60 Blank Page ...
Page 90: ...4 FLIGHT PLANS 80 Active Flight Plan Shortcuts Blank Page ...
Page 122: ...5 PROCEDURES 112 Blank Page ...
Page 154: ...7 NRST PAGES 144 Nearest Airspaces Blank Page ...
Page 186: ...10 FDE 176 Blank Page ...
Page 213: ......