Instruction Manual

Page 5-74 G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
Revision 4 190-00716-01
5.16 GDC 7400 Troubleshooting
5.16.1 Air Data Common Problems
Symptom Recommended Action
Altitude is different than standby
altimeter
• Perform a pitot/static leak and accuracy check per Section 7.6 of
this manual.
• Determine which instrument is outside limits and replace.
Note: The GDC 7400 software for the 300/B300 contains error
correction at 19,000 feet and above. The standby altimeter
does not contain any correction.
5.16.2 GDC 7400 Alerts
Failure Message Cause Solutions
MANIFEST – GDC1 software
mismatch Communication halted.
The system has detected an
incorrect software version loaded
in the specified GDC 7400.
•
Load correct software version.
See Section 3.9 for the Software
Load Procedure.
MANIFEST – GDC2 software
mismatch Communication halted.