What was found
INSPECTION PERFORMED SHORTLY AFTER MAJOR ENGINE OVERHAUL DUE TO SUSPECTED DEFECTIVE SUPERIOR ROCKER SHAFT THRUST BUTTONS INSTALLED AT MAJOR OVERHAUL. ALL THRUST BUTTONS WERE PARTIALLY MELTED AND DEFORMED WITH MELTED PLASTIC DEBRIS FOUND IN ROCKER COVER. DEFECTIVE THRUST BUTTONS WERE REMOVED AND REPLACED WITH LYCOMING THRUST BUTTONS P/N LW-12892. 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 DEFECTIVE LOT NUMBER THRUST BUTTONS INSTALLED IN THEIR ENGINES TO INFORM THEM OF OUR FINDINGS AND TO REMOVE THE PARTS FROM SERVICE. DEFECTIVE LOT NUMBERS IN OUR INVENTORY WERE QUARANTINED.