Airworthiness Directives; Cessna Aircraft Company Models 340A and 414A Airplanes

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This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 98-24-14, which was sent previously to all known U.S. owners and operators of certain Cessna Aircraft Company (Cessna) Models 340A and 414A airplanes that could be equipped with any WYE tube, part number (P/N) 9910299-25 or P/N 9910299-26, in the engine exhaust system. This AD requires removing from service any P/N 9910299-25 or P/N 9910299-26 engine exhaust system WYE tube. The AD resulted from reports of five instances where the engine exhaust components in the WYE tube were manufactured without welds on critical parts that are installed adjacent to the firewall. The actions specified by this AD are intended to detect and correct exhaust leaks caused by nonwelded exhaust system components, which could result in aluminum fuel lines bursting with consequent fuel spillage, an airplane fire, and/or an explosion.