Airworthiness directives › 2026-17-08
AD 2026-17-08 Airworthiness Directives; Pratt & Whitney Division Engines
Models named: PW4074D, 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 (PW) Model PW4074D, PW4077D, PW4084D, PW4090, and PW4090-3 engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For the purpose of this AD, a “part eligible for installation” is: (1) Any HPC drum rotor disk assembly having a part number (P/N) and serial number (S/N) that is not identified in paragraph (h) of this AD. (2) Any HPC drum rotor disk assembly having a P/N and S/N identified in paragraph (h)(1) of this AD that has passed the inspection required by paragraph (h)(1) of this AD.
Unsafe condition
This AD was prompted by the discovery of a quality escape involving incorrect shot peening on certain high-pressure compressor (HPC) drum rotor disk assemblies. The FAA is issuing this AD to prevent failure of the HPC drum rotor disk assembly. The unsafe condition, if not addressed, could result in uncontained debris release, damage to the engine, and damage to the airplane.
Affected ADs
None.
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