What was found
THE OVER LIMIT LIGHT ILLUMINATED ON LANDING. ACCORDING TO PILOT, WAS ON ROUTE, 1 MILE OUT, IN SEMI-WINDY CONDITIONS. DID NOT PUT ACFT IN ANY ABRUPT MOVEMENTS TO CAUSE OVERSPEED CONDITION & NEVER EXPERIENCED A GONG IN HEADSET. AFTER LANDING, AT SHUTDOWN, VEMD SHOWED AN OVER LIMIT. FURTHER INVESTIGATION REVEALED AN NG OF 431 RPM, IAW AMM 05-50-00 6-3, OVER 430 RPM NEEDS TO BE INSPECTED. INSPECTED IAW MM, AND RETURNED TO SERVICE, NOTHING NOTED . PERFORMED A MAINTENANCE TEST FLIGHT TO SIMULATE AND OVERSPEED, REACHING 424 RPM, EXPERIENCE A GONG IN HEADSET, BUT NO LIGHT ILLUMINATED ON VEMD AT SHUTDOWN.