190-01499-00 Rev. A
Garmin GTX 335/345 Pilot’s Guide
7-3
Troubleshooting
7 – TROUBLESHOOTING
ADS-B Position Input Failed
The unit is not receiving GPS.
1. Check power and/or circuit breaker for
the GPS position source (e.g., GTN or
GNS).
2. Make sure the GPS antenna has a clear
view of the sky and provide enough
time for the GPS position source to
obtain a position fix. Extended periods
between use or GPS position source
disconnection from the aircraft battery
could cause a longer than normal GPS
satellite acquisition time.
FIS-B Weather Failed
The FIS-B receiver has
failed. The display of
FIS-B products may be
unavailable.
Contact dealer for service.
Ground Test
The unit is operating in a
mode intended for ground
testing.
Turn the unit off and then back on
again.
Maximum Temperature
Exceeded
The unit is too hot. The
transponder will not transmit
until it has cooled.
Use alternate transponder as the active
transponder, if available, to allow the
GTX 3X5 to cool.
Minimum Temperature
Exceeded
The unit is too cold. The
transponder will not
transmit until it has warmed
up.
Allow time for the GTX 3X5 to warm up to
ensure proper operation.
Pressure Altitude Failed
The GTX 3X5 has lost
communication with the
pressure altitude source.
Check power and/or circuit breaker for the
pressure altitude source (e.g., altitude
encoder, ADC, etc.)
Service Soon
GTX 3X5 has detected an
internal fault but the unit will
continue to function.
Contact dealer for service.
TAS/TCAS Failed
TAS/TCAS is reporting failed
or the GTX 3X5 has lost
communicating with the
TAS/TCAS.
Check power and/or circuit breaker for the
TCAD/TAS/TCAS I System.
GTX 3X5
SYSTEM MESSAGE
EXPLANATION
FLIGHT CREW ACTION
