Airworthiness Directives; Terra Corporation TRT 250 Series Transponders

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This amendment adopts a new airworthiness directive (AD), applicable to Terra Corporation TRT 250 series transponders, that requires removing the transponder from the aircraft, inspecting it to determine if the AD applies, and replacing any affected transponder with a modified Terra Corporation transponder or another transponder that responds properly to Mode S interrogations from both an Air Traffic Control Radio Beacon System (ATCRBS)/Mode S ground station and Traffic Collision Avoidance System (TCAS) II airborne equipment. This amendment is prompted by FAA tests that show that the transponder does not respond properly to certain interrogations by a Mode S or TCAS II signal. The actions specified by this AD are intended to prevent failure of the transponder to respond properly to Mode S interrogations from both Mode S ground stations and TCAS II airborne equipment, which could result in loss of airspace separation.