What was found
AT APPROXIMATELY FIFTY MINUTES INTO THE ONE HOUR FLIGHT, THE CREW STARTED TO NOTICE SLIGHT AVIONICS PROBLEMS ON THE COPILOTS SIDE. SMOKE THEN STARTED TO EMERGE FROM THE RT AVIONICS MASTER SWITCH BREAKER. THE CREW WAS UNABLE TO PHYSICALLY TURN OFF THE SWITCH. SOON THE SMOKE STOPPED AND ALL AVIONICS POWERED BY THAT SWITCH FAILED. THE AC LANDED WITH NO FURTHER PROBLEMS. MAINTENANCE REMOVED DEFECTIVE SWITCH AND DISASSEMBLE TO FIND THE MAIN WIRE FROM THE LINE SIDE HAD COME OFF CAUSING THE POWER TO FIND ITS WAY THROUGH THE SPRING INSIDE THE SWITCH UNTIL ITS FINAL FAILURE.