What was found
DURING FLIGHT, THE NIPPLE THAT ATTACHES OIL PRESSURE SENDER AND HOBBS METER SWITCH ASSEMBLY TO A 90 DEGREE ELBOW, BROKE. THE BROKEN NIPPLE CAUSED COMPLETE ENGINE FAILURE. SUBMITTER RECOMMENDS, PN AN911-1J WHICH IS MADE OF STAINLESS STEEL, BE USED TO PREVENT RECURRENCE. NOTE: AN911-1 IS MADE OF COPPER ALLOY.