What was found
(GBBR) THE ENGINE SUFFERED CATASTROPHIC FAILURE DUE TO ENGINE OIL STARVATION CAUSED BY THE FAILURE/BREAKAGE OF THE TURBOCHARGER OIL RETURN LINE FITTING AT THE REAR OF THE ENGINE. THE LOSS OF ENGINE OIL ULTIMATELY RESULTED IN AN UNCONTAINED FAILURE OF THE NR4 CYLINDER CONNECTING ROD THROUGH THE TOP OF THE ENGINE CASE. RECOMMEND ALL ALUMINUM AN FITTINGS IN OIL OR FUEL SYSTEMS ON ENGINE OR ENGINE COMPONENTS BE REPLACED WITH NEW AT ENGINE O/H.