GNS 430 Pilot’s Guide and Reference
11-8
SECTION 11
TERRAIN
FLTA Alerts
• ‘TERRAIN ADVISORY’ advisory - Estimated
potential impact in approximately 60 seconds
after pop-up alert and annunciation (Figure 11-6).
Similarly, an ‘OBSTACLE ADVISORY’ alert is also
provided.
Figure 11-6 ‘TERRAIN ADVISORY’ Advisory
• ‘TERRAIN AHEAD’ alert (flashing) - Estimated
potential impact in approximately 30 seconds
after pop-up alert and annunciation (Figure 11-7).
Similarly, an ‘OBSTACLE AHEAD’’ alert is also
provided.
Figure 11-7 ‘TERRAIN AHEAD’ Alert (flashing)
Premature Descent Alerting (PDA)
The TERRAIN system issues a Premature Descent alert
when the system detects that the aircraft is significantly
below the normal approach path to a runway. 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 set a
threshold for alerting based on altitude, distance,
and other parameters.
Summary of Contents for GNS 430
Page 1: ...GNS 430 430A Pilot s Guide and Reference...
Page 2: ......
Page 28: ...GNS 430 Pilot s Guide and Reference 1 20 SECTION 1 INTRODUCTION Blank Page...
Page 82: ...GNS 430 Pilot s Guide and Reference 5 16 SECTION 5 FLIGHT PLANS Blank Page...
Page 116: ...GNS 430 Pilot s Guide and Reference SECTION 6 PROCEDURES 6 34 Blank Page...
Page 154: ...GNS 430 Pilot s Guide and Reference 8 14 SECTION 8 NRST PAGES Blank Page...
Page 220: ...GNS 430 Pilot s Guide and Reference APPENDIX B SPECIFICATIONS B 2 Blank Page...
Page 233: ......
