Gdc 74A Related Alerts And Problems - Garmin G1000 Maintenance Manual

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5.8

GDC 74A RELATED ALERTS AND PROBLEMS

5.8.1 Common Problems
Symptom
Altitude is different than
standby altimeter
GDC 74A Config file does not
load.
5.8.2 GDC 74A Related Alerts
Message
MANIFEST – GDC 74A
software mismatch
Communication halted.
Page 5-54
Rev. B
•
Perform a pitot/static check (see OEM Maintenance Manual for
procedure). Allow the GDC 74A to warm up for fifteen minutes
before checking accuracy, per Garmin Service Advisory 0606.
•
Determine which instrument is outside limits and recalibrate or
replace. Note: Both units may individually be in spec but show a
difference in altitude. Do not return a GDC 74A to Garmin for
service if not outside limits.
•
If GDC is outside limits, recalibration may be performed in
accordance with Section 5.9.
•
Replace GDC 74A config module.
•
If problem persists, replace GDC 74A config module wire
harness.
Cause
The system has detected an
incorrect software version
loaded in the GDC 74A
Recommended Action
Solutions
•
Load correct software version.
G1000 System Maintenance Manual
190-00907-00