Allison Engine Company 250-B and 250-C Series Turboshaft and Turboprop Engines Airworthiness Directive Amendment

Summary

The Federal Aviation Administration (FAA) has issued an airworthiness directive (AD) requiring the replacement of beryllium copper main fuel control (MFC) bellows assemblies with Inconel 718 stainless steel welded MFC bellows assemblies in certain Allison Engine Company 250-B and 250-C series engines to address reports of leaking MFC bellows assemblies that can lead to engine failure.