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NAV Displays
Operations
Top-Level Nav Displays (continued)
Turning the Large knob one increment clockwise after entering NAV
mode displays the screen depicted below. Altitude Assist is only
available if the system includes a F/ADS or an altitude encoder. The
Altitude Assist Altimeter Setting display is used to enter the current
local altimeter setting (sea-level barometric pressure). In this example,
the setting is 29.92". For procedural information on entering the
current altimeter setting, see Operations, Setting the Altimeter
Altitude.
RAIM Prediction
Look-ahead RAIM is automatically predicted for the destination
waypoint and ETA. If the ETA changes by more than 10 minutes, the
NMC automatically re-performs the RAIM prediction. The user can
perform a RAIM prediction for any waypoint in the data base for any
date and time from 1980 to 2079. Manual RAIM prediction provides a
RAIM availability indication using approach operation RAIM alarm
requirements (0.3 nm alarm limit) within 15 minutes of the provided
date and time. Any predicted RAIM availability failure within the ±15
minute range is considered a RAIM availability failure.
The top line displays the current RAIM availability status. At
power-up it will display "RAIM Unknown." When manual RAIM
prediction is being done by the GPS sensor, the display will read
"Predicting
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