What was found
UPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE TO THE UPPER MIDDLE FLOATING THRU STUD LOCATION. THE DAMAGE APPEARS TO BE A GOUGE WITH DISPLACED METAL JUST UNDER THE CYLINDER PAD INSIDE THE THRU STUD BORE. IN ADDITION, 2 OF THE THRU STUDS HAVE A MINOR AMOUNT OF DISPLACED STEEL UNDER THE THREADED PORTION ON THE SHOULDER OF THE THRU STUDS. SEE SDR CONTROL# NX422026020600004 FOR DAMAGE TO THRU STUDS. ANOTHER 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.