What was found
(CAN) DURING THE AIRCRAFT FIRST INSPECTION DOCUMENT 12, CHAFFING WAS DISCOVERED IN THE L/H AND R/H MAIN GEAR SIDEBRACE ACTUATOR SUPPORT FITTINGS. IT WAS CAUSED BY THE ANTI ROTATION LUGS FROM THE MLG ACTUATORS ON THE OPPOSITE SIDE OF THE WEAR PLATE ASSEMBLIES P/N 6992023-1. SINCE THE SIDEBRACE ACTUATOR SUPPORTS ARE CONSIDERED PRINCIPAL STRUCTURAL ELEMENTS, AN ENGINEERING LETTER WAS ISSUED TO ADDRESS THE PROBLEM. AN ASSESSEMENT WAS CARRIED OUT ON THE DEPTH OF THE CHAFFING FOLLOWED BY BLENDING OF THE FOUR POINTS OF CONTACT AND CORROSION PROTECTION. (TC# 20190723005)