What was found
ON ARRIVAL, A/C HAD NOSE GEAR UNSAFE LIGHT. CYCLED GEAR SEVERAL TIMES, NO HELP. A/C MADE UNEVENTFUL LANDING. FOUND OVER CENTER MECH STOP BLOCK ATTACH BOLT BACKED OUT, PREVENTING OVER CENTER LINKS FROM FULLY LOCKING. RESECURED STOP BLOCK BOLT, MADE SEVERAL NOSE GEAR RETRACTIONS AND ALL IND NOW NORMAL.