Garmin G1000 NAV III Line Maintenance Manual page 130

13. Load additional config files for optional equipment installed in the aircraft (i.e. GFC700 autopilot) that
list a PFD or MFD file in the PRODUCT window after the optional config file is selected.
For software/configuration troubleshooting see Section B.4, otherwise continue to Section 4.1.3.
4.1.3 GDU Testing
If the display is removed or replaced, the following checks are recommended. Start PFD and MFD in normal
mode. Press the ENT key to acknowledge the agreement on the MFD. Allow the displays to initialize for
approximately one minute. The GRS 77 and GDC 74A require longer initialization periods than do the other
LRUs. During startup, this causes the attitude, airspeed, and altitude fields to be invalid during the first ~40-60
seconds of PFD power-up.
Check the PFD and MFD displays for the following:
1. Check that all COM/NAV display fields are valid in the top corners of the PFD and MFD.
2. Check that altitude, airspeed, vertical speed and OAT fields are valid on the PFD.
3. Check that attitude and heading are valid (unless an AHRS calibration is required).
4. Check that the engine instrument fields are valid on the MFD.
5. Push the red display reversion button on the GMA 1347. Verify both displays enter reversionary mode
(both should have valid altitude, airspeed, vertical speed, and engine instruments).
6. De-activate reversionary mode by pushing the red reversion button.
Insure Jeppesen aviation database is present. Refer to Section B.5 for aviation database update
instructions.
If no other maintenance is required, continue to Section 5.
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G1000 Nav III Line Maintenance Manual
190-00352-00