AD 2022-13-15 Prompted By A Report Of Cracks In The High-Pressure Turbine (HPT) Disk Posts

The FAA is adopting a new airworthiness directive (AD) for certain Williams International Co., L.L.C. (Williams) FJ44-2A, FJ44-2C, FJ44-3A, and FJ44-3A-24 model turbofan engines. 

This AD was prompted by a report of cracks in the high-pressure turbine (HPT) disk posts and failure of an HPT disk post, resulting in the contained fracture of an HPT disk post and blade. This AD requires removing the HPT disk, part number (P/N) 67093, from service before reaching defined cycle limits and replacing it with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective August 9, 2022. 

Supplementary Information: The FAA issued a supplemental notice of proposed rulemaking (SNPRM) to amend 14 CFR part 39 by adding an AD that would apply to certain Williams FJ44-2A, FJ44-2C, FJ44-3A, and FJ44-3A24 model turbofan engines. The SNPRM published in the Federal Register on April 14, 2022 (87 FR 22153). The SNPRM was prompted by a report of cracks in the HPT disk posts and failure of an HPT disk post, resulting in the contained fracture of an HPT disk post and blade. Subsequently, Williams notified the FAA that revised service information was available, which added additional serial-numbered FJ44-2A, FJ44-2C, and FJ44-3A model turbofan engines to the effectivity and updated the compliance time for replacing the HPT disk. In the SNPRM, the FAA proposed to require removing the HPT disk, P/N 67093, from service before reaching defined cycle limits and replacing it with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products. 

 FMI: www.regulations.gov