GPS 400 Pilot’s Guide and Reference
190-00140-60 Rev. E
9-8
SECTION 9
TERRAIN
TERRAIN NOT AVAILABLE ALERT
TERRAIN requires a 3-D GPS navigation solution
along with specific vertical accuracy minimums. Should
the navigation 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
‘TERRAIN NOT AVAILABLE’ is generated on the TERRAIN
Page (Figure 9-8). When the GPS signal is re-established
and the aircraft is within the database coverage area, the
‘TER N/A’ visual annunciation is removed.
Figure 9-8: TERRAIN NOT AVAILABLE Display
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,
‘TER FAIL’ is generated in the annunciation window, and
‘TERRAIN has failed’ is generated on the TERRAIN Page
(Figure 9-9).
Figure 9-9: TERRAIN FAILED Display
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