What was found
AFTER DEPARTURE, THE PILOT NOTICED OIL LEAKAGE EMANATING FROM THE TOP FORWARD SEAM OF THE LT ENGINE COWLING. A SCAN OF THE ENG INSTRUMENTS WAS NOMINAL, HOWEVER THE PILOT ELECTED TO RTB. AFTER LANDING AND CLEARING THE ACTIVE RUNWAY, THE PILOT DECIDED TO SECURE THE LT ENGINE TO PREVENT POSSIBLE DAMAGE FROM OIL LOSS. APPROX 1 QT OF OIL LEAKED FROM THE ENGINE. WHEN EXAMINED, THERE WAS 9.5 QUARTS OF OIL REMAINING IN THE ENGINE. FURTHER INSPECTION OF THE ENGINE, AFTER WASH DOWN, REVEALED CRACKS O THE ENGINE CRANKCASE. THERE WERE 2 AT THE LT REAR AND 1 AT THE RT FRONT JUST ABOVE THE NR 1 CYLINDER EXHAUST TAPPET BOSS. THE ENGINE HAD 1974.5 HOURS SINCE MAJOR OVERHAUL AND 5574.5 HOURS TT. (K)