Garmin G5 Electronic Flight Instrument Part 23 AML STC Maintenance Manual 190-01112-11
Rev. 7
Page 13 of 54
5 TROUBLESHOOTING
5.1 G5 Electronic Flight Instrument
5.1.1 General
NOTE
The term ‘Red-X’ refers to a red “X” that appears on different areas of the display to indicate the
failure of that particular function
If a Red-X appears on the display or anywhere in the configuration mode menus, the following
troubleshooting steps may be used to help identify the cause.
1.
Review the airframe logbook to verify if any G5 or other avionics or electrical maintenance has
been performed recently that may have contributed to the failure.
2.
Check for loose wire terminals on the circuit breaker connections on the power wire(s) causing
intermittent power connections. Also, check for intermittent circuit breakers.
3.
Check that all connectors are fully seated, and that the jack screw connectors are fully tightened
on both sides of all connectors.
4.
Check for a loose wire harness that is able to move around during flight. This condition may
cause the wire to pull on or vibrate the connector, making intermittent connections.
5.
Ensure that the G5 is mounted securely.
6.
Look for any heavy objects that may not be fastened tight to the aircraft structure that could be
inducing vibration in the G5's attitude sensors.
7.
Look for evidence of water or fluid contamination in the area around the G5.
8.
Unplug the connector on the G5 or any affected LRU and check for bent pins.
NOTE
If a Lightning Protection Module is installed, check for continuity between backshell leads per
Garmin G5 Electronic Flight Instrument Part 23 AML STC Installation Manual, 190-01112-10
section 5.
9.
Inspect the wire harness clamp on the rear of all connectors to verify that it is not too tight and
smashing/shorting the wires.
5.1.2 Attitude
If the attitude is failed and shows a Red-X condition, follow the troubleshooting steps in the previous
section. If this does not resolve the issue, gather answers to the following questions. This information
may be helpful to the customer, the avionics dealer, or to Garmin Aviation Product Support in
troubleshooting the failure.
1) What specifically was the nature of the failure? Was it a Red-X of only GPS track, only pitch/roll,
or a combination?
2) If there was a Red-X of pitch or roll information, did the unit display an alignment message
(which is indicative of a reset), or a failure message (which is indicative of an invalidated output)?
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