Terrain Alerting; Alert Types - Garmin GNC 355 Pilot's Manual

Terrain Alerting

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

Alert Types

Available alerting functions depend on the installed terrain system.
ALERT TYPE
Imminent Impact
[1]
Reduced
[1]
Clearance
Premature
[2]
Descent
[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.
190-02488-01 Rev. B
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
Pilot's Guide
Hazard Awareness
CONDITION
5-43