G900X/G950 Installation and Maintenance Manual – PICP & Warranty Registration
Page C-49
190-00719-00
Revision D
C.2.21.6 GDU Failure Test
Step Desired
Result
MFD Display Failure Conditions:
1. Remove power from MFD.
2. Check for desired results.
3. Restore power to MFD.
The following shall occur when power is removed
from the MFD:
9
PFD switches to reversion mode
9
Attitude and Heading remain valid from AHRS
9
Airspeed, Altitude, Vertical Speed, and OAT
remain valid from Air Data Computer
9
Valid Engine Instrumentation appears on PFD
9
XPDR field remains valid on PFD
9
COM2/NAV2 fields flag invalid
PFD Display Failure Conditions:
1. Remove power from PFD.
2. Check for desired results.
3. Replace power to PFD.
The following shall occur when power is removed
from the PFD:
9
MFD switches to reversion mode
9
Attitude and Heading remain valid from AHRS
9
Airspeed, Altitude, Vertical Speed, and OAT
remain valid from Air Data Computer
9
MFD retains engine instrumentation
9
Valid XPDR field appears on MFD
9
COM1/NAV 1 fields flag invalid
9
“XTALK ERROR – A flight display crosstalk error
has occurred” alert message on MFD