G1000 Nav III Line Maintenance Manual
Page 2-59
190-00352-00
Rev.
L
2.6
GDC 74A
2.6.1
Common Problems
Symptom Recommended
Action
Altitude is different than standby
altimeter
•
Perform a pitot/static check (see applicable airframe specific
maintenance manual for procedure). Allow the GDC to warm up for
fifteen minutes before checking accuracy, per Garmin Service Advisory
0606.
•
Determine which instrument is outside limits and recalibrate or replace.
The GDC is field adjustable, see Section 2.6.4. Note: Both units may
individually be in spec but show a difference in altitude. Do not return
the GDC to Garmin for service if not outside limits.
GDC Config file does not load.
•
Replace GDC config module.
o
If problem persists, replace GDC config module wire harness.
2.6.2
GDC 74A Related Alerts
Message Cause
Solutions
MANIFEST – GDC1 software
mismatch. Communication
Halted.
The system has detected an
incorrect software version
loaded in the GDC 74A.
•
Load correct software version in the
GDC74A.
Summary of Contents for G1000 NAV III
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