What was found
PILOT CALLED AND REPORTED A COMPLETE AVIONICS FAILURE. AFTER LANDING I SPOKE WITH THE PILOT AND HAD HIM POWER THE AVIONICS BACK ON TO TELL ME THE SPECIFIC SYSTEMS THAT FAILED WHILE MECHANICS WERE ENROUTE. WE WERE ABLE TO DERMINE THAT THE AVIONIC SYSTEMS THAT DID FAIL WERE ON THE DCT/BAT SYSTEM, AND NOT A COMPLETE AVIONICS FAILURE. MAINTENANCE ARRIVED ON SITE AND VERIFIED FAILURE OF THE DCT/BAT SYSTEM. WE WERE ABLE TO BYPASS THE SWITCH AND TEST THAT THE SYSTEMS DID POWER ON. WE ORDERED AND REPLACED THE 35P CONTACTOR AND 30A PANEL DCT/BAT SWITCH. POST MAINTENANCE TEST WERE PERFORMED WITH NO ISSUES.