What was found
PILOT NOTED RAPID LOSS OF ENGINE OIL PRESSURE. INITIATED PRECAUTIONARY LANDING. VISUAL INSPECTION OF MODIFIED P/N 68761 DRAINBACK LINE CUTOFF FOR AIR-SIPHON PUMP ( AIR-OIL SEPARATOR STC NR SA3687WE INSTALLATION FOUND SHARP, UNDRESSED AND UNBEADED IAW ORIGINAL INSTALLATION INSTRUCTIONS (CIRCA 1993 BY 337) CAUSED INSIDE OF MIL-6000-5/6 HOSE TO BE CUT CAUSING MASSIVE OIL LEAK. PRESENT STC HOLDER, NOW SUPPLIES ONE-PIECE AIR-SIPHON PUMP P/N W-2046 TO REPLACE THIS ASSEMBLY. RECOMMEND REPLACING ORIGINAL CUTOFF DRAIN TUBES WITH NEW PART TO PREVENT OIL LOSS.