Garmin G900X Installation And Maintenance Manual page 497

C.2.22.3 Display Failure Test
Step
MFD Display Failure Conditions:
1. Remove power from MFD.
2. Check for desired results.
3. Restore power to MFD.
PFD 1 Display Failure Conditions:
1. Remove power from PFD 1.
2. Check for desired results.
3. Restore power to PFD 1.
PFD 2 Display Failure Conditions:
1. Remove power from PFD 2.
2. Check for desired results.
3. Restore power to PFD 2.
C.2.22.4 GRS/GDC Backup Path Test
Step
Secondary AHRS/ADC path check:
1. Remove power from PFD1.
2. Remove power from GIA2.
3. Check for desired results.
4. Restore power to the PFD1 and GIA2.
Secondary AHRS/ADC path check:
5. Remove power from PFD2.
6. Remove power from GIA1.
7. Check for desired results.
8. Restore power to the PFD and GIA1.
G900X/G950 Installation and Maintenance Manual – PICP & Warranty Registration
190-00719-00
Desired Result
The following shall occur when power is removed
from the MFD:
Attitude and Heading remain valid from AHRS
Airspeed, Altitude, Vertical Speed, and OAT
remain valid from Air Data Computer
The following shall occur when power is removed
from
PFD 1:
Attitude and Heading remain valid from AHRS
"Both On AHRS2/ADC2" indication onPFD2
Airspeed, Altitude, and Vertical Speed remain
valid from Air Data Computer
MFD retains engine instrumentation
The following shall occur when power is removed
from
PFD 2:
Attitude and Heading remain valid from AHRS
"Both On AHRS1/ADC1" indication onPFD1
Airspeed, Altitude, and Vertical Speed remain
valid from Air Data Computer
MFD retains engine instrumentation
Desired Result
The following shall occur on the MFD when power is
removed from the PFD1 and GIA2:
Attitude and Heading remain valid from AHRS
Airspeed, Altitude, and Vertical Speed remain
valid from Air Data Computer
Engine Instrumentation flags invalid
All COM & NAV fields flag invalid
The following shall occur on the MFD when power is
removed from the PFD and GIA2:
Attitude and Heading remain valid from AHRS
Airspeed, Altitude, and Vertical Speed remain
valid from Air Data Computer
Engine Instrumentation flags invalid
All COM & NAV fields flag invalid
Page C-53
Revision D