Low Pressure Compressor Fan Hub - Inspection / Replacement
- Published
- Effective
- Deadline
- Replaces
- 2018-21-11
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform an eddy current inspection of the LPC fan hub assembly before accumulating 550 flight cycles after November 7, 2023, and repeat inspections at intervals not exceeding 550 flight cycles. If a rejectable crack indication is found, the LPC fan hub assembly must be removed from service. Stakeholders should refer to Pratt & Whitney Alert Service Bulletin PW4G-112-A72-362 Revision No. 2 for detailed inspection procedures.
Summary
Airworthiness Directive 2023-19-02 is a final rule issued by the FAA addressing Pratt & Whitney Division Model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 engines. It mandates repetitive eddy current inspections of the low-pressure compressor (LPC) fan hub assembly to detect cracks and requires removal from service if cracks are found. This directive aims to prevent LPC fan hub failure that could lead to uncontained debris release and damage to the engine and aircraft.
What changed
This AD supersedes AD 2018-21-11 by expanding the applicability to include all LPC fan hub assemblies installed on the specified PW engine models, not just certain part numbers. It removes the requirement for repetitive fluorescent penetrant inspections and shortens the intervals for eddy current inspections. Additionally, it no longer requires removal of LPC fan hubs with reportable indications but only those with rejectable indications.
Why it matters
This directive is critical for aviation professionals because it updates inspection requirements based on new analysis and incident reports, ensuring early detection of cracks in LPC fan hubs. Operators and maintenance organizations must adjust their inspection schedules and procedures to comply with the shortened inspection intervals and expanded applicability. Compliance reduces the risk of catastrophic engine failure and enhances overall flight safety.
More for Pratt & Whitney PW4070
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- EASA AD US-2023-22-02Engine - Combustion Section Outer Diffuser Case - Inspection / RemovalNov 22, 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
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