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Operations
Message Displays
Loss of RAIM Detection Function
The following status message will be generated if the RAIM status
becomes "Unavailable" (meaning there are not enough satellited to
perform RAIM calculations) during Oceanic flight phase. This should
be a temporary condition. The NMC will continue to provide
navigation information while RAIM is unavailable. This message
becomes an "Old" message after being acknowledged, and remains
until GPS RAIM become available.
Oceanic RAIM Alarm
The following message will be generated when a persistent RAIM
alarm occurs during the active Oceanic flight phase due to the NMC
being unable to exclude an unhealthy satellite or verify that it has
excluded the faulty satellite. This message becomes an "Old" message
after being acknowledged, and remains until the RAIM alarm
condition ends. NAV will be flagged, but the NMC will continue to
provide cross-track information.
MCLS Station Warnings
The display below shows the Loran signals are unusable. In this
example MCLS 1 has a low SNR (Signal-to-Noise Ratio). The bottom
line will display "Signal Blink" or "Cycle Error" instead if either of
those conditions occur. It becomes an old message after viewing.
MCLS TD Sensor Failure Warning
The display below shows a TD sensor for an MCLS has failed. In the
example below, the MCLS 1 TD sensor has failed. This message clears
only after the Loran sensor is repaired. It becomes an old message after
viewing.
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