What was found
DURING ANNUAL INSPECTION, FOUND MAIN GEAR DOWNLOCK SUPPORT ASSEMBLY LOOSE AND ALLOWING SHIM TO MIGRATE. ALL 4 BOLTS WHICH SECURE SUPPORT WERE LOOSE. MM CALLS FOR THESE BOLTS TO BE LOCTITED AND SECURED WITH A SHAKEPROOF WASHER. ASSUMING THAT VIBRATION OVER TIME CAUSED LOOSENESS AS NO PARTS WERE DEFECTIVE. TIGHTENED SUPPORT AND RIGGED PER CESSNA 210 MANUAL. OPS CHECK OK. SUBMITTER STATED IF LEFT LOOSE, IT IS POSSIBLE TO HAVE NO INTERMITTENT GEAR DOWN INDICATIONS.