What was found
DURING A 6 YEAR/ 8,000 CYCLE LANDING GEAR INSPECTION, DAMAGE WAS FOUND ON ALL 4 MAIN LANDING TORQUE KNEE`S AT THE UPPER (PN 101-8100321) AND LOWER (PN1018100327) KNEE`S ATTACH POINT. ITS SUSPECTED THAT IN THE PAST, SOMEONE HAD ATTACHED SOME KIND OF HOOK CLAMPING DEVICE TO THE TWO TORQUE KNEE`S SO WHEN JACKING THE WING THE STRUT WOULDN’T EXTEND AND YOU ONLY NEEDED TO JACK A SHORT DISTANCE, UNFORTUNATELY THE HOOKS SEVERELY DAMAGED THE TORQUE KNEE`S TO A POINT WHERE THEY WERE CONSIDERED UNSERVICEABLE BY MFG. ALL MAIN LANDING GEAR TORQUE KNEE`S WERE REPLACED WITH NEW PARTS PURCHASED FROM MFG. THESE KNEE`S ARE NOT CHEAP, SO THAT SHORT CUT WAS A COSTLY MISTAKE. RECOMMENDATIONS ARE TO FOLLOW AIRCRAFT MM.