What was found
DURING THE COURSE OF A 100-HOUR INSPECTION, THE MECHANIC NOTICED A SIZEABLE AMOUNT OF OIL ON THE TOP LEFT PORTION OF THE ENGINE CASE. A CLOSER INSPECTION REVEALED A CRACK APPROXIMATELY 1.6250 INCH LONG EMITTING FROM THE 9TH BACKBONE BOLT (COUNTING FROM FRONT TO BACK). THE CRACK/CASE WAS INSPECTED IAW TCM SBM90-17 AND WAS DETERMINED TO BE UNAIRWORTHY DUE TO THE AMOUNT OF OIL LEAKING FROM SAID CRACK/CASE. THE CASE IN QUESTION HAS NOT BEEN REPAIRED/WELDED IN THE AREA AROUND THE CRACK. (THE CASE IS THE 'HEAVY' - 7TH STUD VERSION).