What was found
LEAKING FASTENERS LOCATED ON THE RIGHT WING LOWER SURFACE REMOVABLE PLANK, CAME UPON INCORRECT FASTENER INSTALLED. FASTENER WAS A 6 MM DIAMETER RATHER THAN A 5 MM DIAMETER AND SHORT IN LENGTH. FOUND THAT NUTPLATE, LOCATED INSIDE WING FUEL TANK, WAS MISSING OR BROKEN. AFTER REMOVAL OF PR SEALANT INSIDE THE FASTENER HOLE, DISCOVERED THE HOLE TO BE OVERSIZED AND TAPPED. VISUAL INSPECTION REVEALED THAT FASTENERS WERE NOT INSTALLED IN THEIR EXACT LOCATION, NUMEROUS FASTENERS, ON THE REMOVABLE PLANK, NOT LOCKED INTO THE NUT PLATES LOCATED INSIDE THE WING TANK. IMPROPER FASTENER INSTALLATION AND UNAUTHORIZED MODIFICATION TO THE WING PLANK, COULD SERIOUSLY JEOPARDIZE THE SAFETY OF THE CREW AND PASSENGERS.