What was found
DURING AN ANNUAL INSPECTION, THE MUFFLER ASSEMBLY WAS REMOVED TO REPLACEMENT. AT THIS TIME IT WAS DISCOVERED THAT THE MUFFLER SHROUD INLET SCAT TUBE WAS MAKING CONTACT WITH THE LOWER LEFT SIDE ENGINE MOUNT LEG. NO VISIBLE DAMAGE TO THE SHROUD ASSEMBLY. A DEEP GOUGE LINE WAS VISIBLE ON THE ENGINE MOUNT. AIRCRAFT RECORDS INDICATE THAT THE CUB CRAFTERS SERVICE BULLETIN SB0010 WAS PREVIOUSLY COMPILED WITH ASSEMBLY. COMPLIANCE WAS ACCOMPLISHED IN ACCORDANCE WITH PARAGRAPH 3. THE MECHANIC FOUND MORE THAN 0.25 INCHES OF CLEARNACE.