Garmin G1000 Nxi System Maintenance Manual page 170

Invalid Data Field
NAV2 & COM2
GPS LOI
XPDR FAIL
TAS FAIL
AIRSPEED FAIL
ALTITUDE FAIL
VERT SPEED FAIL
OAT
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Associated
LRU(s)
•
Check configuration settings for GIA2 and PFD2.
•
Swap GIA1 and GIA2, to verify location of problem:

GIA2
If problem follows GIA2, replace GIA2.
•
Check Ethernet interconnect from GIA2 to PFD2.

If problem persists, replace PFD.
•
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 – GPS
Status page. Refer to GIA GPS section if GPS cannot
acquire a position lock for troubleshooting.
GIA1 or GIA2
•
Check corresponding GPS antenna and cable for 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 335R/345R/33/33D/3000 configuration settings
for GIA1 and GIA2.
•
Check GTX 335R/345R/33D/3000 and GIA1 interconnect.
GTX 335R,
•
Check GTX 335R/345R/33D/3000 and GIA2 interconnect.
GTX 345R,
•
Perform a SET>ACTV configuration reset on the GTX Config
GTX 33( ), or
page for each GTX, and verify the aircraft registration is
GTX 3000
present.
•
Replace GTX 335R/345R/33/33D/3000.

If problem persists, replace GIA.
•
Inspect GSU 75B/GDC 7400 pitot/static plumbing integrity.
•
Inspect pitot/static ports and associated equipment for faults.
•
GSU 75B or
For TAS failure, also check GTP 59 probe.
GDC 7400
•
Check GSU 75B/GDC 7400 configuration settings for the
PFDs, MFD, GIA1, and GIA2.

If problem persists, replace the GSU 75B/GDC 7400.
•
GTP 59 Check OAT probe wiring and connectors for faults.
•
GSU 75B, or
Replace GSU 75B/GDC 7400 with a known good unit:

GDC 7400
If problem persists, replace the GTP 59.
Solution
Page 157
Revision 1