Garmin G1000 NAV III Line Maintenance Manual page 109

SLIP CLUTCH TEST RESULTS
Not activated at this time.
2.11.2 GFC 700 Pre-Flight Test Sequence and Troubleshooting
This section was created to help determine why the GFC 700 has failed the Pre-Flight Test indicated by the red
PFT annunciation
provides troubleshooting information to help resolve failures.
There are 16 steps to the GFC 700 PFT. The PFT is performed by both GIA's at startup, and needs to pass on
both GIA's before the autopilot can be engaged.
The PFT is only started if the AHRS has aligned, the GIA's and servos are configured and the certification gains
are valid. If the PFT has not completed after one minute from when the initialization started, the PFT will fail.
After the system PFT has passed, it will be performed again if a servo resets, if the autopilot servo breaker is reset
or the cross side GIA restarts it.
Generally, the PFT failure fault is logged in the GIA Maintenance Log and not in the Servo Maintenance Logs
unless the GIA log fault identifies a servo problem.
Thoroughly understanding the operation of the G1000 system in configuration mode is
recommended before starting this procedure.
To access the GIA and GSA Maintenance Logs, perform the following steps –
1. Start the G1000 in Configuration mode.
2. Use the FMS knob on the PFD to go to the Diagnostics Terminal page in the System group. This page
allows the technician to view maintenance logs associated with the GFC 700.
3. Choose 'GIA 1' or 'GIA 2' in the LRU window.
4. In the SERVO window, choose 'NONE' to view the GIA Maintenance Log, or choose a servo to view
their logs.
5. Using the FMS knob, choose 'VIEW MAINTENANCE LOG' in the COMMAND window.
6. Press the ENT key.
7. Scroll through the OUTPUT list by pressing the OUTPUT softkey.
The GIA Maintenance Log can record any of the following faults:
•
FCS Task not started: Bad gains
The FCS task has not started because the gains are not present or have become corrupt.
Reload the gain files to correct.
•
FCS Task not started: Gain structure out of range
The FCS task has not started because the gains are not compatible with the GIA software.
Reload the gain files to correct.
•
PFT FAIL: Timeout, <STEP>
Pre-flight test has failed because the specified step has not passed in the allotted time. See the GIA pre-flight
steps for a description of the possible values for <STEP> on the failed GIA and corrective actions.
G1000 Nav III Line Maintenance Manual
190-00352-00
, it defines the PFT sequence for the servos and the GFC 700 system and then
NOTE
Page 2-81
Rev. L