What was found
AIRCRAFT STARTED TO LAND UNTIL PROP, FLAPS, AND STEP CONTACTED RUNWAY. A GO AROUND WAS INITIATED, LANDING GEAR WAS SELECTED DOWN AND A NORMAL LANDING WAS MADE. PILOT STATED HE DID NOT HEAR A GEAR WARNING HORN. AFTER AIRCRAFT WAS FERRIED HOME, GEAR SYSTEM CHECKED NORMAL. TEST FLIGHT AFTER AIRCRAFT REPAIR WAS NORMAL, GEAR WARNING HORN SOUNDED AT 13 INCHES TO 15 INCHES MAP. RETURNED AIRCRAFT TO SERVICE.