Garmin G1000 NAV III Line Maintenance Manual page 30

2.1.1.1 System Annunciation Troubleshooting
Annunciation
NAV1 or COM1
NAV2 or COM2
GPS INTEG or Time
XPDR FAIL
TAS, AIRSPEED FAIL,
ALTITUDE FAIL,
VERT SPEED FAIL
OAT
and
TAS
Page 2-2
Rev. L
Associated Solution
LRU
•
Check configuration settings for GIA1 and the PFD
•
Check Ethernet interconnect from GIA1 to the PFD
•
GIA1
Switch GIA1 and GIA2, to verify location of problem:
If problem follows GIA1, replace GIA1.
o
If problem persists, replace PFD.
o
•
Check configuration settings for GIA2 and the MFD
•
Check Ethernet interconnect from GIA2 to the MFD
•
GIA2
Switch GIA1 and GIA2, to verify location of problem:
If problem follows GIA2, replace the GIA2.
o
If problem persists, replace MFD.
o
•
Ensure that a cell phone or a device using cell phone
technology is not turned on (even in a monitoring state) in
the cabin.
•
Check GPS1 and GPS2 signal strength on AUX page 3
•
Check corresponding GPS antenna and cable
GIA1 or 2
•
Check Ethernet interconnect between the PFD and GIA1
or MFD and GIA2 for faults.
•
Switch GIA1 and GIA2, to verify location of problem:
If problem follows the GIA, replace the GIA.
o
If problem persists, replace the MFD or PFD.
o
•
Check GTX 33 configuration settings for GIA1 and GIA2
•
Perform a SET>ACTV configuration reset on the GTX
GTX 33
Config page, and verify the aircraft registration is present.
•
Replace the GTX 33
•
Inspect GDC 74A pitot/static plumbing integrity.
•
Inspect pitot/static ports and associated equipment.
•
For TAS failure, also check GTP 59 probe.
•
Check GDC 74A configuration settings for the PFD, MFD,
GDC 74A
GIA1, and GIA2
If PFD, MFD, and GIA configuration settings are
o
correct, replace the GDC configuration module.
If problem persists, replace the GDC 74A
o
•
Check OAT probe wiring and connectors for faults.
•
Check GDC config module wiring for damage, replace if
any is found.
GTP 59
•
Replace GDC config module
•
Replace GDC 74A with a known good unit:
If problem persists, replace the GTP 59.
o
G1000 Nav III Line Maintenance Manual
190-00352-00