What was found
(CAN) DURING 100 HR. INSPECTION THE NR 2 ENGINE COWL WAS REMOVED. WHEN THE COWL WAS LOWERED TWO NUTS WITH HALF THE STUDS FELL OUT ONE 3/8 INCH AND ONE 1/2 INCH. AFTER FURTHER INSPECTION IT WAS NOTICED THAT THE NR 2 CYL HOLD DOWN STUDS ON THE LOWER HALF OF THE CYL WAS MISSING. WHEN THE CYL. WAS REMOVED IT WAS NOTED THAT THE CYL HAD A LARGE CRACK BETWEEN THE TOP SPARK PLUG HOLE TO THE EXHAUST VALVE. THE PARTS HAVE BEEN SENT OFF TO TSB TO DETERMINE THE REASON FOR BREAKAGE.