10-19
190-01004-03 Rev. P
GTN 625/635/650 Pilot’s Guide
Terrain
Terrain
Inhibited
Annunciation
Touch to Toggle
Terrain Inhibit
Figure 10-11 Terrain Alerting Inhibited Annunciation
1. While viewing the Terrain page, touch the
Menu
key.
2. Touch the
Terrain Inhibit
key to inhibit or enable terrain
alerting (choice dependent on current state). A green bar in
the key indicates the inhibit function is active.
10.5.6.5 Altitude Voice Call Out (VCO)
Terrain provides aural advisory alerts as the aircraft descends, beginning at
500 feet above the terrain, as determined by the radar altimeter (if greater than
5 NM from the nearest airport) or 500 feet above the nearest runway threshold
elevation (if less than 5 NM from the nearest airport). Upon descent to this
altitude, the terrain system issues the aural alert message “Five-hundred.”
10.5.6.6 Terrain Not Available Alert
Terrain requires a 3-D GPS position solution along with specific vertical
accuracy minimums. Should the position solution become degraded or if
the aircraft is out of the database coverage area, the annunciation “TER N/A”
is generated in the annunciation window and on the Terrain page. The aural
message “Terrain Not Available” is generated. When the GPS signal is re-
established and the aircraft is within the database coverage area, the aural
message “Terrain Available” is generated (when the aircraft is airborne).
10.5.6.7 Terrain Failure Alert
Terrain continually monitors several system-critical items such as database
validity, hardware status, and GPS status. If the terrain/obstacle database is not
available, the aural message “Terrain System Failure” is generated along with a
“TER FAIL” annunciation.
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