What was found
PILOT REPORTED OIL CONSUMPTION AT APPROXIMATELY 1 QUART PER HOUR. NO OIL FOUND AT THE FORWARD OR REAR CARBON SEALS. OIL WAS DISCOVERED INSIDE THE FUEL PUMP BY A FUEL SAMPLE ANALYSIS FROM THE FUEL PUMP FILTER BOWL. ON ENGINES INCORPORATING SB 72-0104 (WET SPLINE FUEL PUMP DRIVE), THE OIL CAN PASS THROUGH A SMALL ORIFICE IN THE FUEL PUMP IMPELLER SHAFT WHICH IS PACKED WITH A SPECIAL GREASE. ONCE THE GREASE IS WASHED AWAY, THE ENGINE FUEL PUMP DRAWS IN OIL INTO THE FUEL FLOW. THE PROBLEM WAS REPAIRED BY GARRETT WITH A PLUG INSTALLED IN THE IMPELLER SHAFT. SUBMITTER STATES SECOND INCIDENT FOUND IN 5 MONTHS.