FAA Proposes New Airworthiness Directive for GARMIN GTX 330/330D Mode S Transponders

Summary

The Federal Aviation Administration (FAA) is proposing a new airworthiness directive requiring the installation of a software upgrade for certain GARMIN International Inc. GTX 330/GTX 330D Mode S transponders to prevent inaccurate replies to interrogating aircraft, which could lead to reduced vertical separation or unsafe TCAS resolution advisories.