Summary
We propose to adopt a new airworthiness directive (AD) for Honeywell International Inc. TFE731-4, -4R, -5AR, -5BR, and -5R turbofan engines. This proposed AD was prompted by a report of certain interstage turbine transition (ITT) ducts failing to meet containment capability requirements. This proposed AD would require replacing certain ITT ducts. We are proposing this AD to prevent failure of the ITT duct, which could lead to an uncontained part release, damage to the engine, and damage to the airplane.