Garmin G1000 Maintenance Manual page 41

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System Annunciation Troubleshooting (continued)
Annunciation
XPDR FAIL
TAS FAIL
AIRSPEED FAIL,
ALTITUDE FAIL,
VERT SPEED FAIL
OAT
and
TAS
G1000 System Maintenance Manual
190-00907-00
Associated
LRU
•
Check PFD Alert Window for GIA1/2 and GTX 33
configuration, software or failed data path error
messages. Correct any errors before proceeding.
•
Perform a SET>ACTV configuration reset on the
GTX Transponder Configuration page for each
installed GTX.
GTX 33
•
For GTX 33 transponders verify the aircraft
registration is entered in the GTX Transponder
Configuration page.
•
Check the GIA and GTX racks for connector pin
faults (push-back or bent) on the RS-232
interconnect lines.
•
Replace the GTX 33.
•
Check PFD Alert Window for PFD, MFD or GDC
configuration, software or failed data path error
messages. Correct any errors before proceeding.
•
Verify the GDC's are online by checking for a
green checkmark next to the GDC on the MFD Aux
– System Status page.
1. If the GDC is not online (a Red-X will be
GDC 74A
2. Replace the GDC 74A.
•
Inspect GDC 74A pitot/static ports and plumbing
for blockage.
•
Replace the GDC 74A configuration module.
•
For TAS failure only, replace the GTP 59.
•
Check OAT probe wiring, probe and connectors for
faults or damage.
•
Replace GDC 74A config module and pigtail
GTP 59
harness.
•
Replace the GTP 59.
•
If problem remains. replace GDC 74A.
Solution
present instead of a green check mark), check
for wiring/power faults and GDC connector
security.
Page 5-5
Rev. B