2 - NAV PAGES
50
190-00357-00 Rev C
TERRAIN Failure Alert
The TERRAIN system continually monitors
several system-critical items, such as database validity,
hardware status, and GPS status. Should the system
detect a failure, a message is annunciated “TERRAIN
has failed”.
“TERRAIN has failed” message
“TERRAIN Not Available” Alert
TheTERRAINsystemrequiresa3DGPS
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 “TERRAIN
NOTAVAILABLE”isdisplayedontheTERRAINPage.
“TERRAIN NOT AVAILABLE” display
Terrain Alerts
(EIGHT!BOVE4ERRAIN&EET
$ISTANCE&ROM$ESTINATION!IRPORTNM
0$!!LERTING!REA0$!!LERTING!REA
2UNWAY
4HRESHOLD
Premature Descent Alerting (PDA) Threshold
