What was found
WHILE PREPARING ACFT TO INSTALL AEROSPACE LIGHTING CORPORATION'S PROTECTED POWER SUPPLIES IN THE CABIN FLUORESCENT LIGHTING SYSTEM, AN INSPECTION OF THE HIGH VOLTAGE WIRING REVEALED A SHORT LENGTH OF WIRE THAT HAD BURNED INSULATION. THERE WAS NO DAMAGE TO ANY EQUIPMENT OR STRUCTURE IN THE AREA. A COMPLETE INSPECTION OF THE HIGH VOLTAGE WIRE SYSTEM UNCOVERED SEVERAL SPOTS WHERE IT APPEARED THAT HIGH VOLTAGE HAD ARCED BETWEEN 2 WIRES (BROWN PIN HOLES). ALL OF THESE SPOTS WERE LOCATED WHERE THE WIRE HAD BEEN TIE-WRAPPED TOGETHER. THE PROTECTED POWER SUPPLIES THAT ARE BEING INSTALLED WOULD HAVE SHUT THE SYSTEM DOWN IN THIS CONDITION. AD 90-14-06 HAD BEEN C/W. MFG P/N, MIL SPEC W-16878.