Garmin G900X Installation And Maintenance Manual page 464

Figure C-13. PFD Power-up System Annunciations
In the normal operating mode, data fields that are invalid have large red X's through them (Figure C-13).
A valid field does not display a red X. Allow the displays to initialize for approximately one minute. The
GDC 74A requires a longer initialization period than do the other LRUs. During normal operation, this
causes the airspeed, altitude, vertical speed, and OAT fields to be invalid during the first ~40-60 seconds
of PFD power-up.
5. Check that all COM/NAV fields are valid in the top corners of the PFD and MFD.
6. Check that altitude, airspeed, vertical speed, TAS, and OAT fields are valid on the PFD.
7. Check that engine instrument fields are valid on the MFD.
8. Push the red DISPLAY BACKUP button on the GMA 1347. Verify both displays enter reversion
mode: both should have valid altitude, airspeed, vertical speed, and engine instruments.
9. De-activate reversion mode by pushing the DISPLAY BACKUP button again.
10. Verify that no MANIFEST or CONFIGURATION alert messages appear in the lower right
corner (press the flashing ALERTS softkey to view alert messages). If any MANIFEST errors
appear, the correct software to the related LRU must be loaded before proceeding.
Page C-20
Revision D
G900X/G950 Installation and Maintenance Manual – PICP & Warranty Registration
190-00719-00