Engine - High-Pressure Turbine Disk - Replacement
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Williams FJ44-2A, FJ44-2C, FJ44-3A, and FJ44-3A-24 engines must remove and replace the HPT disk, P/N 67093, within the compliance times specified in the directive and the referenced service bulletin. After August 9, 2022, installing the affected HPT disk is prohibited. Maintenance teams should follow the procedures in Williams International Service Bulletin WISB-72-1032, Revision 2, to perform the replacement.
Summary
The Federal Register Volume 87, Number 127 (July 5, 2022) final rule titled "Engine - High-Pressure Turbine Disk - Replacement" is an airworthiness directive issued by the FAA for Williams International Co., L.L.C. FJ44-2A, FJ44-2C, FJ44-3A, and FJ44-3A-24 model turbofan engines. It addresses cracks and failures in the high-pressure turbine (HPT) disk posts, specifically part number 67093, which could lead to engine and aircraft damage.
What changed
This new airworthiness directive requires the removal and replacement of the affected HPT disk, P/N 67093, before reaching specified cycle limits. It prohibits the installation of this HPT disk part number on any engine after the effective date. The directive incorporates Williams International Service Bulletin WISB-72-1032, Revision 2, dated June 4, 2020, as the approved method for compliance.
Why it matters
This directive is critical for aviation professionals because it prevents potential catastrophic engine failures caused by cracked or broken HPT disk posts. Operators and maintenance organizations must ensure timely replacement to maintain engine integrity and flight safety. Compliance reduces the risk of in-flight engine damage and associated safety hazards.
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