Altitude Voice Call Out (Vco); Terrain Not Available Alert; Terrain Failure Alert - Garmin GTN 750 Pilot's Manual Upgrade Supplement

Terrain
Inhibited
Annunciation
Figure 11-11 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.
11.5.6.5

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."
11.5.6.6

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).
11.5.6.7

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.
190-01007-03 Rev. Q GTN 725/750 Pilot's Guide
Foreword
Touch To Toggle
Terrain Inhibit.
Xpdr Ctrl
Com/Nav
Direct-To
Wpt Info
Weather
Services/
Messages
Appendix
11-19
Getting
Started
Audio &
FPL
Proc
Charts
Map
Traffic
Terrain
Nearest
Music
Utilities
System
Symbols
Index