AFMS N°D01 FOR GARMIN GFC700 AUTOPILOT INSTALLATION AND
RNAV/RNP NAVIGATION ELIGIBILITY
Section 4 – Normal procedures
AUTOPILOT ABNORMAL PROCEDURES
Changes in wind speed and/or wind direction compound the relative in-
accuracy of DR Mode. Because of this degraded accuracy, other naviga-
tion equipment must be relied upon for position awareness until GPS-
derived position data is restored.
DR Mode is indicated on the G1000 by the appearance of the letters ‗DR‘ super-
imposed 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 display. 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 solution 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 degraded 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 approach 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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