Airworthiness Directive DCA/RAD/28A Garmin Mode S XPDR S/W Upgrade

Airworthiness Directive DCA/RAD/28A Garmin Mode S XPDR S/W Upgrade

This AD is applicable to the following Garmin Transponders:

• GTX33
• GTX33D
• GTX330
• GTX330D

It requires upgrading of the software to version 3.03, 3.06 or later.  

This is an old AD that should have been complied with by now.  If you suspect your aircraft has not had it done, give us a call and we can help you determine if you need it.

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