What was found
ONE LOWER ENGINE MOUNT BOLT BROKE IN-FLIGHT, CONDITION WAS DISCOVERED BY OWNER WHILE CHECKING OIL. ENGINE MOUNT SPACER WENT OUT THROUGH PROPELLER CAUSING SIGNIFICANT DAMAGE TO PROPELLER. WHEN MFG WAS ASKED, THEY SAID NEW BOLTS ARE NOW INSTALLED AND SENT 4 NEW ONES. WHEN THE OTHER 3 BOLTS WERE REMOVED, A VERY VISIBLE WEAR MARK WAS NOTED WHERE THE ONE BROKE. FOUR BOLTS OF THE NEW P\N NAS1307-52 WERE INSTALLED.