What was found
CIRCUIT PROTECTION FOR AVIONICS IS PROVIDED BY TWO 30-AMP AUTOMOTIVE TYPE SPADE FUSES PLUGGED INTO A 'FUSE PANEL'. FUSE PANEL IS HOUSED IN A 'J' BOX CALLED THE 'MASTER CONTROL UNIT'. PROBLEM IS SPECIFIC TO 'FUSE PANEL' BURNING METAL SPADE TERMINALS OF 30-AMP FUSE RENDERING AVIONICS INOPERABLE. EXACT CAUSE IS NOT KNOWN, SUBMITTER STATED REPLACING FUSE DOES NOT CORRECT PROBLEM. ON A FLEET OF SIXTY LIKE AIRCRAFT, THIS PROBLEM IS OCCURRING SEVERAL TIMES A WEEK.