For pilots with existing Garmin GTX 330 panel-mount or GTX 33 remote-mount transponders in their aircraft, the ES upgrade can provide a simple, straightforward solution for meeting ADS-B “Out” equipage requirements to fly in NextGen airspace.
Your GTX series transponder may or may not have ES capability already installed. Existing ES transponders may need to have their software updated before they qualify as ADS-B “Out” compliant under TSO-C166b criteria. You can get this update directly from your authorized Garmin dealer. If your transponder is not an ES version, an upgrade is available. This upgrade, from a non-ES transponder to an ES version, will require your dealer to ship the unit back to Garmin for the upgrade.
To understand if your GTX 330 is an ES version, look at the splash screen when your avionics are being powered on. You’ll see either “GTX 330” or “GTX 330 ES” to show which version you have. The same is true of the remote GTX 33.
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