Instruction Manual

Page 5-18 G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
Revision 3 190-00716-01
5.2.2 System Failure Troubleshooting
The following table provides basic troubleshooting guidance for LRU failures. Refer to G1000/GFC 700
Wiring Diagram, listed in Table 1-2, as needed to verify interconnects.
Invalid Data Field
Associated
LRU(s)
Solution
Low Speed Awareness Band
permanently displayed
GDU
• With aircraft weight on wheels and the G1000 in
Configuration Mode, check that the RH GEAR ON
GROUND Discrete In indication for GIA2, on GIA I/O
CONFIGURATION page is illuminated.
• With aircraft weight on wheels and the G1000 in
Configuration Mode, check that the LH GEAR ON
GROUND Discrete In indication for GIA1, on GIA I/O
CONFIGURATION page is illuminated.
• If both indications are illuminated Green, switch GIA1
and GIA2, to verify location of problem:
9 If problem is resolved, replace defective unit.
9 If indication is not illuminated, check for wiring
faults between the GIAs and aircraft squat switch
system.
Low Speed Awareness Band
permanently inhibited
GDU
• With aircraft weight on wheels and the G1000 in
Configuration Mode, check that the RH GEAR ON
GROUND Discrete In indication for GIA2, on GIA I/O
CONFIGURATION page is illuminated.
• With aircraft weight on wheels and the G1000 in
Configuration Mode, check that the LH GEAR ON
GROUND Discrete In indication for GIA1, on GIA I/O
CONFIGURATION page is illuminated.
• If both indications are illuminated Green, switch GIA1
and GIA2, to verify location of problem:
9 If problem is resolved, replace defective unit.
9 If indication is not illuminated, check for wiring
faults between the GIAs and aircraft squat switch
system.
NAV1 & COM1
GIA1
• Check configuration settings for GIA1 and PFD1.
• Swap GIA1 and GIA2, to verify location of problem:
9 If problem follows GIA1, replace GIA1.
• Check Ethernet interconnect from GIA1 to PFD1.
9 If problem persists, replace PFD.
NAV2 & COM2
GIA2
• Check configuration settings for GIA2 and PFD2.
• Swap GIA1 and GIA2, to verify location of problem:
9 If problem follows GIA2, replace GIA2.
• Check Ethernet interconnect from GIA2 to PFD2.
9 If problem persists, replace PFD.