Appendix – Garmin MX20 User Manual

Page 132

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Appendix

Problem

Possible Cause

Action

XPDR flag

TIS-A Sensor Installation

Ensure that the TIS-A unit is
installed and functional.

ADSB flag

GDL 90 is reporting that its internal
GPS is not reporting a position or
is reporting an invalid position.
Note that ADS-B broadcasts do not
include position reports when this
flag is present.

Ensure the GDL 90 is installed and
functional. Ensure the GDL 90 GPS
antenna has a clear view of the sky
to receive GPS signals.

IDENT (green) flag

This is not a problem. This flag
appears when the GDL 90 is in the
Ident mode.

None required.

See the Installation Manual for additional troubleshooting procedures.

Troubleshooting