Airworthiness directives › 2023-19-02
AD 2023-19-02 Airworthiness Directives; Pratt & Whitney Division Engines
Models named: PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, PW4090-3. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all Pratt & Whitney Division Model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Before accumulating 550 flight cycles (FC) after the effective date of this AD, and thereafter at intervals not to exceed 550 FC since the last eddy current inspection (ECI), perform an ECI of the LPC fan hub assembly, in accordance with the Accomplishment Instructions, For Engines Installed on Aircraft, paragraph 2., or For Engines Not Installed on Aircraft, paragraph 3; of Pratt & Whitney Alert Service Bulletin (ASB) PW4G-112-A72-362, Revision No. 2, dated August 2, 2023 (ASB PW4G-112-A72-362, Revision 2). (2) If a rejectable indication is found during the inspections required by paragraph (g)(1) of this AD, before further flight, replace the LPC fan hub assembly with a part eligible for installation.
Unsafe condition
This AD was prompted by an updated analysis by the engine manufacturer, which indicated certain low-pressure compressor (LPC) fan hubs could crack before their published life limit. We are issuing this AD to prevent failure of the LPC fan hub. The unsafe condition, if not addressed, could result in uncontained hub release, damage to the engine, and damage to the airplane.
Affected ADs
This AD replaces AD 2018-21-11, Amendment 39-19469 (83 FR 54663, October 31, 2018).
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1