Got an old muffler? Time to replace it.
The FAA has issued a Special Airworthiness Information Bulletin advising airplane owners of a concern about carbon monoxide (CO) and old mufflers. In a Wichita State University study focusing on CO safety issues in general aviation accidents, researchers found the muffler system was the top source of CO. For cases where the muffler was identified as the source of the CO leakage, 92% had a muffler with more than 1,000 hours of service.
The FAA recommends that owners replace mufflers with more than 1,000 hours and again at each 1,000-hour interval, unless a more frequent replacement is required. The agency also recommends using CO detectors during each flight.