Maintenance Manual
190-02472-02
G3X Touch EFIS Part 23 AML STC
Revision 2
Page 36
Table 5-4 – Unit Communication Error Messages (Dual GDU Installations)
Failure Message
Possible Cause
Recommended Action
GDU software version
mismatch
The two GDU displays are
using incompatible software
versions
Update the GDU with incorrect software
version
“[UNIT]” network address
changed”
State of a GDU's mode pins
was detected to have changed.
Check for loose connections and
reference the
G3X Touch EFIS Part 23
AML STC Installation Manual
(190-
02472-01) for information on GDU
mode pin connections
“GDU COMM ERROR –
CHECK GDU WIRING”
Indicates that more than one
GDU is configured to be the
same unit type (e.g. two
displays are configured as
PFD)
Verify and correct GDU mode pin
connections per the
G3X Touch EFIS
Part 23 AML STC Installation Manual
(190-02472-01)
[Navigation/Terrain/Obstacle]
Database Missing
Indicates that a required
database is missing on the
specified GDU display.
Update databases as required.
[Navigation/Terrain/Obstacle]
Database Mismatch
Indicates that the GDU displays
have different versions of the
specified database.
Update the databases in all GDU
displays to the same cycle number.
5.3.5 GDU Reboot During Engine Start in a 14-volt Aircraft
If the GDU display inadvertently reboots during engine start, troubleshoot aircraft electrical system for
anything that might result in low bus voltage during engine start, reference Table 5-5 for recommended
actions.
NOTE
Flickering and dimming during engine start are not considered rebooting. The display has to turn
off and initialize again (generally requiring 20-30 seconds) to be considered a reboot.
Table 5-5 – GDU Reboot During Engine Start
Symptom
Possible Cause
Recommended Action
GDU display reboots
during engine start
(14-volt
aircraft only)
Low bus voltage
Troubleshoot aircraft electrical system for:
insufficient battery capacity
poor starter performance
insufficient wire gauge in starter circuit
high resistance through wire connections, circuit
breakers, or solenoids
other issues in the starter circuit and primary power
distribution system
Summary of Contents for G3X Touch
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