What was found
DURING AIRCRAFT INSPECTION FOR 10,000-HOUR X-RAY OF WING, FOUND 4 HUCK RIVETS ON LEFT WING JACK PAD WS 96 ON PN 5520130 JACK PAD FITTING WERE IMPROPERLY SWAGED AND COLLARS WERE MISSING. NO RECORD OF ANY WORK DONE IN THIS AREA. AREA NOT INSPECTED ON PHASE INSPECTIONS. ENGINEERING APPROVAL OBTAINED TO INSTALL HI-LOK AS REPLACEMENTS GRIP LENGTH ON ORIGINAL FASTENERS WAS TOO LONG CAUSING IMPROPER SEATING OF RIVET COLLARS. SUGGEST VISUAL INSPECTION ON ALL AIRCRAFT.