EASA AD US-2023-22-02
Engine - Combustion Section Outer Diffuser Case - Inspection / Removal
Summary
Airworthiness Directive 2023-22-02 is a final rule issued by the FAA addressing Pratt & Whitney Division Model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 engines. The directive focuses on inspecting and replacing the combustion section outer diffuser case (ODC) to prevent cracks that could lead to engine and aircraft damage. It mandates fluorescent penetrant inspections and replacement of certain ODC parts with modified versions to reduce stress-related cracking.
What Changed
This AD supersedes AD 2018-02-10 by expanding the applicability to all ODC part numbers and adjusting the compliance thresholds for inspections. It requires replacing certain ODCs with modified parts designed to reduce stress and cracking susceptibility. The directive also retains the requirement to update the Airworthiness Limitations Section for mandatory inspections.
Why It Matters
This directive is critical for aviation professionals as it addresses a known unsafe condition that could cause engine failure and aircraft damage. Operators and maintenance organizations must enhance inspection programs and ensure timely replacement of affected parts to maintain airworthiness and safety. Compliance reduces the risk of in-flight engine issues related to ODC cracking.
What To Do
Operators must perform initial high sensitivity fluorescent penetrant inspections of the ODC T3 thermocouple probe boss within specified flight cycle thresholds depending on the ODC's service history. Repetitive inspections are required thereafter, and any cracked ODC must be removed and replaced with a modified or zero-time part. The Airworthiness Limitations Section must be updated accordingly. The AD becomes effective on December 26, 2023.
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