AFMS N°D01 FOR GARMIN GFC700 AUTOPILOT INSTALLATION AND
RNAV/RNP NAVIGATION ELIGIBILITY
Section 4 – Normal procedures
AUTOPILOT ABNORMAL PROCEDURES
AUTOPILOT ABNORMAL PROCEDURES 8
Loss of a single GPS:
In case of loss of a single GPS, RNAV guidance will still be available as the sys-
tem will automatically revert to the other available GPS without losing any auto-
pilot / FD guidance.
The ALERT window will switch to ADVSY and start to flash; when selected a
―AHRS1 GPS – AHRS1 using backup GPS source‖ CAS message will appear in-
side the alert window.
Loss of both GPS:
In case of loss of both GPS, RNAV guidance will not be available anymore.
The ALERT window will switch to ADVSY and start to flash; when selected a
―GPS NAV LOST – Loss of GPS navigation. Insufficient satellites‖ CAS message
will appear inside the alert window. In this case also ESP will be lost and the
―ESP OFF‖ CAS message will also appear inside the alert window.
Further to that, a yellow ―LOI‖ (loss of integrity) CAS message will be displayed
on the HIS and all other GPS related information (e.g. wind) will turn to yellow.
If GPS nave mode is being selected, the HSI on the PFD will not display the devi-
ation bar. If GPS is selected as navigation source a “AHRS1 GPS – AHRS1 oper-
ating exclusively in no-GPS mode“ CAS message will appear inside the alert win-
dow.
Dead Reckoning Mode only functions in Enroute (ENR) or Oceanic
(OCN) phase of flight. In all other phases, an invalid GPS solution pro-
duces a “NO GPS POSITION” annunciation on the map and the G1000
stops using GPS.
It is important to note that estimated navigation data supplied by the G1000 in DR
Mode may become increasingly unreliable and must not be used as a sole means
of navigation. If while in DR Mode airspeed and/or heading data is also lost or not
available, the DR function may not be capable of accurately tracking estimated
position and, consequently, the system may display a path that is different than the
actual movement of the aircraft. Estimated position information displayed by the
G1000 through DR while there is no heading and/or airspeed data available shall
not be used for navigation.
DR Mode is inherently less accurate than the standard GPS/SBAS Mode due to
the lack of satellite measurements needed to determine a position.
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