10-17
190-01004-03 Rev. P
GTN 625/635/650 Pilot’s Guide
Terrain
Alert Type
Alert
Annunciation
Aural Message
Voice Call Out
(VCO-500)
None
“Five-Hundred”
* Alerts with multiple messages are configurable at installation and are
installation-dependent. Alerts for the default configuration are indicated with asterisks.
Table 10-8 Alerts Summary
10.5.6.2 Forward Looking Terrain Avoidance
Reduced Required Terrain Clearance (RTC), Reduced Required Line
Clearance (RLC),
and
Reduced Required Obstacle Clearance (ROC)
alerts
are issued when the aircraft flight path is above terrain, yet is projected to come
within the minimum clearance values in the FLTA Alert Minimum Terrain and
Obstacle Clearance Values table. When an RTC, RLC, and/or a ROC alert is
issued, a threat location indicator is displayed on the Terrain page.
Imminent Terrain Impact (ITI), Imminent Line Impact (ILI),
Imminent Obstacle Impact (IOI)
alerts are issued when the aircraft is below
the elevation of a terrain or obstacle cell in the aircraft’s projected path. ITI, ILI,
and IOI alerts are accompanied by a threat location indicator displayed on the
Terrain page. The alert is annunciated when the projected vertical flight path is
calculated to come within minimum clearance altitudes in the following table.
Flight Phase
Minimum Clearance Altitude (feet)
Level Flight
Descending
En Route
700
500
Terminal
350
300
Approach
150
100
Departure
100
100
Table 10-9 FLTA Alert Minimum Terrain and Obstacle Clearance Values
During final approach, 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.
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