What was found
UPON INSPECTION AFTER MAJOR ENGINE OVERHAUL, IT WAS DISCOVERED THAT THE ROCKER SHAFT THRUST BUTTONS HAD EITHER PARTIALLY OR COMPLETELY MELTED. A COMPLETE ENGINE TEARDOWN INSPECTION WAS THEN PERFORMED, ONLY ONE CYLINDER HAD BOTH THRUST BUTTONS COMPLETELY INTACT. MELTED PLASTIC DEBRIS WAS DISCOVERED IN THE ROCKER COVERS, OIL SUMP SCREEN, OIL GALLERIES, AND OIL PUMP. THEN ENGINE HAS ONLY 37.8 HOURS SMOH, THIS FAILURE POSES A SEVERE RISK TO FLIGHT SAFETY. INFORMATION THAT WE RECEIVED STATED THAT FAULTY THRUST BUTTONS WILL FLOAT IN WATER AND GOOD PARTS WILL SINK. WE PERFORMED THIS TEST ON EVERY LOT NUMBER IN OUR INVENTORY AND FOUND SEVERAL LOT NUMBER BATCHES THAT FLOAT. WE THEN CONTACTED ANY CUSTOMERS WITH THE SUSPECT LOT NUMBER THRUST BUTTONS INSTALLED IN THEIR ENGINES TO INFORM THEM OF OUR FINDINGS AND TO REMOVE THE PARTS FROM SERVICE. SUSPECT LOT NUMBERS IN OUR INVENTORY WERE QUARANTINED.