Section 4 – Normal procedures
AUTOPILOT ABNORMAL PROCEDURES
AFMS N°D07 FOR GARMIN GFC700 AUTOPILOT AND VARIABLE PITCH PROPELLER EQUIPPED
AEROPLANES
Changes in wind speed and/or wind direction compound the relative inaccuracy
of DR Mode. Because of this degraded accuracy, other navigation equipment
must be relied upon for position awareness until GPS derived position data is re-
stored.
DR Mode is indicated on the G1000 by the appearance of the letters ‗DR‘ superimposed in
yellow over the ‗own aircraft‘ symbol.
In addition, ‗DR‘ is prominently displayed in yellow on the HSI slightly above and to the
right of the aircraft symbol on the CDI. Also, the CDI deviation bar is removed from the dis-
play. Lastly, but at the same time, a ‗GPS NAV LOST‘ alert message appears on the PFD.
Normal navigation using GPS/SBAS source data resumes automatically once a valid GPS so-
lution is restored. As a result of operating in DR Mode, all GPS derived data is computed
based upon an estimated position and is displayed as yellow text on the display to denote de-
graded navigation source information.
Also, while the G1000 is in DR Mode, some terrain functions are not available. Additionally,
the accuracy of all nearest information (airports, airspaces, and waypoints) is questionable.
Finally, airspace alerts continue to function, but with degraded accuracy.
RAIM AVAILABILITY:
Because of tighter protection limit on approaches, there may be times when RAIM is not
available. The G1000 automatically monitors RAIM and warns with an alert message when it
is not available. If RAIM is not predicted to be available for the final approach course, the ap-
proach does not become active, as indicated by the message ―Approach is not active‖.
If RAIM is not available when crossing the FAF, the missed approach procedure must be
flown.
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