Section 4 – Normal procedures
AUTOPILOT ABNORMAL PROCEDURES
AFMS N°D07 FOR GARMIN GFC700 AUTOPILOT AND VARIABLE PITCH PROPELLER EQUIPPED
AEROPLANES
8 AUTOPILOT ABNORMAL PROCEDURES
Loss of a single GPS:
In case of loss of a single GPS, RNAV guidance will still be available as the system will au-
tomatically revert to the other available GPS without losing any autopilot / 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 inside 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 in-
side the alert window. In this case also ESP will be lost and the ―ESP OFF‖ CAS mes-
sage 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 deviation bar. If
GPS is selected as navigation source a “AHRS1 GPS – AHRS1 operating exclusively in no-
GPS mode“ CAS message will appear inside the alert window.
Dead Reckoning Mode only functions in Enroute (ENR) or Oceanic (OCN)
phase of flight. In all other phases, an invalid GPS solution produces 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 sat-
ellite measurements needed to determine a position.
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