Terrain Alerting; Alert Types - Garmin GPS 175 Pilot's Manual

5.18 Terrain Alerting

Terrain-FLTA provides visual alerts for potential flight path conflicts involving terrain,
obstacles, or power lines. Alerting function behavior is determined at installation.
Non-TSO C151c certified terrain alerting system
•
FLTA functions: RTC, RLC, ROC, ITI, ILI, and IOI
•
Terrain depictions and display overlays
•
• Cautions and warnings indicate alert severity and threat type
Textual annunciations
•
Pop-up alerts
•
Threat location indication on map displays (Map page, Terrain page)
•
• Self-test and alert inhibit functionality
5.18.1

Alert Types

Available alerting functions depend on the installed terrain system.
ALERT TYPE
Imminent Impact
[1]
Reduced
Clearance [1]
Premature
Descent [2]
[1] Alerting inhibited <200 ft AGL within 0.5 nm of approach runway or <125 ft AGL within 1.0
nm of runway threshold.
[2] Alerting inhibited within 0.5 nm of approach runway or <125 ft AGL within 1.0 nm of runway
threshold. Alerting thresholds for final descent are based on current position, speed, and flight
path data.
190-02207-02 Rev. 1 GPS 175/GNX 375 Pilot's Guide
TERRAIN-FLTA FEATURES
Aircraft reaches the minimum clearance altitude of any
obstacle (IOI), terrain (ITI), or power line (ILI) in the
projected flight path.
Aircraft's vertical flight path is projected to be within the
minimum clearance altitude of an obstacle (ROC), terrain
(RTC), or power line (RLC).
Aircraft is significantly below the normal approach path
for the nearest runway.
Altitude is <700 ft above terrain
•
• Distance from destination airport is 15 nm or less
Hazard Awareness
CONDITION
5-37