Forward Looking Terrain Avoidance; Additional System Annunciations; Minimum Terrain And Obstacle Clearance Values For Flta Alerts - Garmin GNS 530 Pilot's Manual & Reference

SECTION 12
TERRAIN
Table 12-3 shows system status annunciations that may also be issued:
Alert Type
TERRAIN System Test Fail
TERRAIN Alerting is disabled
No GPS position or excessively degraded
GPS signal
System Test in progress
System Test pass

Forward Looking Terrain Avoidance

The Forward Looking Terrain Avoidance (FLTA) alert is used by TERRAIN and is composed of:
• Reduced Required Terrain Clearance (RTC) and Reduced Required Obstacle Clearance (ROC) -These alerts are
issued when the aircraft flight path is above terrain, yet is projected to come within the minimum clearance
values in Table 12-4. When an RTC or ROC alert is issued, a potential impact point is displayed on the
TERRAIN Page.
• Imminent Terrain Impact (ITI) and Imminent Obstacle Impact (IOI) - These alerts are issued when the
aircraft is below the elevation of a terrain or obstacle cell in the aircraft' s projected path. ITI and IOI alerts are
accompanied by a potential impact point displayed on the TERRAIN Page. The alert is annunciated when the
projected vertical flight path is calculated to come within minimum clearance altitudes in Table 12-4.
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 approach runway or below 125 feet AGL while within 1.0 nm of the runway
threshold.
Phase of Flight
Approach
Departure
Table 12-4 Minimum Terrain and Obstacle Clearance Values for FLTA Alerts
12-6
TERRAIN Page
Annunciation
None
Table 12-3 Additional System Annunciations
Minimum Clearance
Altitude Level Flight (ft)
Enroute
Terminal
GNS 530(A) Pilot's Guide and Reference
Pop-Up Alert
None
None
None
None
None
Minimum Clearance
Altitude Descending (ft)
700 500
350 300
150 100
100 100
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