Hazard Awareness
190-02488-01 Rev. B Pilot’s Guide 5-43
Terrain Alerting
Receive visual alerts for potential flight path conflicts involving terrain, obstacles, or
power lines. Alerting behavior is determined at installation.
Alert Types
Available alerting functions depend on the installed terrain system.
[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.
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 TYPE CONDITION
Imminent Impact
[1]
Aircraft reaches the minimum clearance altitude of any
obstacle (IOI), terrain (ITI), or power line (ILI) in the
projected flight path.
Reduced
Clearance
[1]
Aircraft’s vertical flight path is projected to be within the
minimum clearance altitude of an obstacle (ROC), terrain
(RTC), or power line (RLC).
Premature
Descent
[2]
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
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