What was found
UPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON 2 OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DISPLACED STEEL UNDER THE THREADED PORTION ON THE SHOULDER OF THE THRU STUDS. THE DAMAGE APPEARS TO BE VERY MINOR BUT DUE TO THE SIMILAR LOCATION AND SEVERITY OF THE DAMAGE REPORTED IN SDR CONTROL# NX422026020600001, I FELT IT WAS BEST PRACTICE TO REPORT IT. THE LEFT HAND CRANKCASE OF THIS ENGINE ALSO HAS DAMAGE TO THE INSIDE OF ONE THRU STUD BORE LOCATION (SEE SDR CONTROL# NX422026020600003). A SECOND FIRST RUN ENGINE S/N# L-39643-51E WAS DISCOVERED TO HAVE SIMILAR DAMAGE TO ALL 4 THRU STUD BORE LOCATIONS (SEE SDR CONTROL# NX422026020600001) AND 2 OF THE THRU STUDS (SEE SDR CONTROL# NX422026020600002). PREVIOUSLY A REPORT HAD BEEN SUBMITTED IN DECEMBER ON A THIRD ENGINE S/N# L-39621-51E FOR THE SAME LEFT HAND CRANCASE DAMAGE TO ALL 4 OF THE THRU STUD BORES. UNFORTUNATELY, I CANNOT FIND THE CONTROL# FOR THIS REPORT. UPON CLOSER INSPECTION OF THIS THIRD ENGINE, I HAVE FOUND SOME MINOR DAMAGE TO 1 OF THE THRU STUDS IN THE SAME LOCATION AS THOSE LISTED IN THE REPORTS ABOVE.