What was found
WHILE C/W AD 75-17-32-R2 - LANDING GEAR OPERATING MECHANISM, A CRACK WAS FOUND IN THE RIGHT INTERNAL WING RIB BRACKET. THE CRACK WAS LOCATED AT THE UPPER RADIUS AND WAS APPROXIMATELY .75 INCH IN LENGTH. SUBMITTER STATED THE CRACK WAS MOST LIKELY CAUSED BY IMPROPER INSTALLATION. THE BRACKET IS RIVETED TO A WING RIB AND ATTACHED TO THE REAR SPAR WITH BOLTS. IT APPEARS WHEN THE BRACKET WAS ATTACHED TO THE RIB, IT DID NOT CONTACT THE REAR SPAR, CONSEQUENTLY, WHEN THE BOLTS WERE TORQUED, THEY 'PULLED' THE BRACKET CAUSING IT TO CRACK. SIAI MARCHETTI MANDATORY SB NR 205B37E ADDRESS THIS PROBLEM.