In Use Position Sensor Lat/Lon Failure Message
When the In Use position sensor cannot compute the Latitude and
Longitude, a message is generated for either the Loran or GPS sensor.
GPS POSITION
SENSOR CANNOT
COMPUTE LAT/LON
GPS RAIM Detection Not Available
When RAIM detection is not available for the in-use GPS sensor, a
warning is generated. The top line indicates the current flight phase
(either Approach, Terminal, or En Route) which directly affects
RAIM detection requirements. It becomes an old message after
viewing.
ENROUTE
GPS RAIM
NOT AVAILABLE
GPS RAIM Alarm Position Error
When RAIM detection is available for the in-use GPS sensor and it
detects a RAIM alarm, a warning is generated and NAV data will be
flagged as invalid. The top line indicates the current flight phase
(either Approach, Terminal, or En Route), which directly affects
RAIM alarm requirements. It becomes an old message after viewing.
If the “Abort Approach” message is given, you must abort the
approach by pressing the OBS/HOLD button and exercise the missed
approach procedure.
ABORT APPROACH
GPS RAIM ALARM
POSITION ERROR
GPS HDOP Accuracy Error
When the HDOP for the in-use GPS sensor exceeds current flight
phase HDOP requirements, a warning is generated and NAV data is
flagged as invalid. The top line indicates the current flight phase
(either Approach, Terminal, or En Route) which directly affects
HDOP requirements. It becomes an old message after viewing. If the
“Abort Approach” message is given, you must abort the approach by
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Operations Message Displays
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