What was found
DURING L/G EXT IN FLT, LT MAIN AND NOSE GEAR DOWN AND LOCKED IND PRESENT, WITH NO RT IND AND LOUD BANGING SOUND FROM RT SIDE OF A/C. C/O FLY-BY TO VISUALLY VERIFY ALL THREE LANDING GEARS WERE DOWN. A/C LANDED SAFELY, VERIFIED ALL 3 L/G WERE DOWN AND LOCKED BEFORE TAXING A/C OFF RUNWAY. DURING INSPECTION ACT TQ TUBE TO ACT DRIVE BOLT FOUND MISSING. TQ TUBE END AND ACT DRIVE INSPECTED FOR DAMAGE/CRACKS WITH 10X MAGNIFYING GLASS. NO DAMAGE EVIDENT. INNER TQ TUBE SPACER REPLACED DUE TO SOME SCORING OF INNER BORE. A NEW DRIVE BOLT AND LOCK NUT WAS INSTALLED ON LT AND RT ACT. LANDING GEAR SYSTEM INSPECTION/RIGGING C/O: GOOD IAW KA200 MM NR 101-590010-19B9 CHAPTER 32-30-00. FIVE FAULT FREE GEAR SWINGS C/O.