Garmin G1000 System Maintenance Manual page 139

Invalid Data Field
GPS LOI
XPDR FAIL
TAS FAIL
AIRSPEED FAIL
ALTITUDE FAIL
VERT SPEED FAIL
OAT
G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
190-00716-01
Associated
LRU(s)
•
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 4. Refer to GIA GPS section if GPS can not
acquire a position lock for troubleshooting.
•
Check corresponding GPS antenna and cable for
GIA1 or GIA2
faults.
•
Check Ethernet interconnect between the PFD1 to
GIA1 or PFD2 to GIA2 for faults.
•
Swap GIA1 and GIA2, to verify location of problem:
If problem follows the GIA, replace the GIA.
If problem persists, replace the PFD1 or PFD2.
•
Check GTX 33/33D configuration settings for GIA1 and
GIA2.
•
Check GTX 33D/GIA1 interconnect.
•
Check GTX 33D/GIA2 interconnect.
GTX 33 •
Perform a SET>ACTV configuration reset on the GTX
Config page for each GTX, and verify the aircraft
registration is present.
•
Replace GTX 33/33D.
If problem persists, replace GIA.
•
Inspect GDC 7400 pitot/static plumbing integrity.
•
Inspect pitot/static ports and associated equipment for
faults.
•
For TAS failure, also check GTP 59 probe.
GDC 7400
•
Check GDC 7400 configuration settings for the PFDs,
MFD, GIA1, and GIA2.
If PFDs, MFD, and GIA configuration settings are
correct, replace the GDC configuration module.
If problem persists, replace the GDC 7400.
•
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 7400 with a known good unit:
If problem persists, replace the GTP 59.
Solution
Revision 1
Page 5-19