# Proposed AD FAA-2026-2724: Pratt & Whitney Division Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2026-17-08
- Products: Pratt & Whitney Division
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 24, 2026, 91 FR 13984
- Comments due: May 8, 2026
- Became: [AD 2026-17-08](https://openairdocs.org/ad/2026-17-08)
- Docket: FAA-2026-2724 (https://www.regulations.gov/docket/FAA-2026-2724, where comments are filed)
- Project: AD-2025-01606-E
- FR document: 2026-05686
- Official PDF: https://openairdocs.org/files/sha256/ba/5f/ba5fbc4c250ea4dceaa8d3834f2ae3c048985e6ff01e9372350813b5151f9fa8 (from https://www.govinfo.gov/content/pkg/FR-2026-03-24/pdf/2026-05686.pdf)
- Federal Register: https://www.federalregister.gov/documents/2026/03/24/2026-05686/airworthiness-directives-pratt-and-whitney-division-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-05686-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2026-2724

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Pratt & Whitney Division (PW) Model PW4074D, PW4077D, PW4084D, PW4090, and PW4090-3 engines. This proposed AD was prompted by the discovery of a quality escape involving incorrect shot peening on certain high-pressure compressor (HPC) drum rotor disk assemblies. This proposed AD would require visually inspecting the HPC drum rotor disk assembly for incorrect shot peen coverage and, depending on the results of the inspection, replacing the HPC drum rotor disk assembly with a part eligible for installation. This proposed AD would also require removing and replacing certain HPC drum rotor disk assemblies before reaching certain life limits. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Mar 24, 2026: Notice of proposed rulemaking (NPRM). (first notice), FR document 2026-05686, comments due May 8, 2026 (https://www.federalregister.gov/documents/2026/03/24/2026-05686/airworthiness-directives-pratt-and-whitney-division-engines)

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