Engine - Combustion Section Outer Diffuser Case - Inspection / Removal
- Published
- Effective
- Deadline
- Replaces
- 2018-02-10
AI-generated summary of the official EASA document. Verify against the PDF before acting.
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.
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.
More for Pratt & Whitney PW4070
All 9- EASA AD US-2026-17-08Turbine - High-Pressure Compressor Drum Rotor Disk - Inspection / ReplacementSep 8, 2026
- EASA AD US-2023-19-02Low Pressure Compressor Fan Hub - Inspection / ReplacementOct 13, 2023
- EASA AD US-2022-07-13Engine Oil - Air/Oil Heat Exchanger - Inspection / ReplacementApr 20, 2022
- EASA AD US-2022-06-09Engine - 1st-Stage Low-Pressure Compressor Blades - Inspection / RemovalMar 14, 2022
- EASA AD US-2021-05-51SUPERSEDED BY FAA AD 2022-06-09
Get the next one by email
New ADs and bulletins for Pratt & Whitney PW4070, & Whitney PW4080 and & Whitney PW4090, summarized like this page, every Monday.