Pilot's Operating Handbook
Supplement 49
GARMIN TAWS system
Edition 2 - December 31, 2015
Rev. 2
Page 9.49.8
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Imminent Terrain Impact and Imminent Obstacle Impact
Imminent Terrain Impact (ITI) and Imminent Obstacle Impact (IOI) alerts are
issued when the airplane is below the elevation of a terrain or obstacle cell in the
airplane's projected path. ITI and IOI alerts are accompanied by a potential
impact point displayed on the TAWS Page. The alert is annunciated when the
projected vertical flight path is calculated to come within minimum clearance
altitudes in table 9.49.1.
Phase of flight
Minimum Clearance
Altitude Level Flight (ft)
Minimum Clearance
Altitude Descending (ft)
Enroute
700
500
Terminal
350
300
Approach
150
100
Departure
100
100
Table 9.49.1 - Minimum Terrain and Obstacle Clearance values for FLTA alerts
During the final approach phase of flight, FLTA alerts are automatically
inhibited when the airplane 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.
PIM - DO NOT USE FOR FLIGHT OPERATIONS
