# Proposed AD FAA-2025-0923: Pratt & Whitney Division Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2026-09-02
- Products: Pratt & Whitney Division
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 6, 2025, 90 FR 24085
- Comments due: July 21, 2025
- Became: [AD 2026-09-02](https://openairdocs.org/ad/2026-09-02)
- Docket: FAA-2025-0923 (https://www.regulations.gov/docket/FAA-2025-0923, where comments are filed)
- Project: AD-2024-00529-E
- FR document: 2025-10332
- Official PDF: https://openairdocs.org/files/sha256/18/05/180504efac891bf99e95ec8c83638f78df596881dcddc8820cef935015d3452e (from https://www.govinfo.gov/content/pkg/FR-2025-06-06/pdf/2025-10332.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/06/06/2025-10332/airworthiness-directives-pratt-and-whitney-division-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-10332-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-0923

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Pratt & Whitney Division (PW) Model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 engines. This proposed AD was prompted by an analysis of an event involving an International Aero Engines, LLC (IAE LLC) Model PW1127GA-JM engine, which experienced a high-pressure compressor (HPC) 7th-stage integrally bladed rotor (IBR-7) separation that resulted in an aborted takeoff. This proposed AD would require repetitive angle ultrasonic scan inspections (AUSIs) of the HPC 15th-stage disks, front turbine hubs, high pressure turbine (HPT) 1st-stage air seals, and HPT 2nd-stage hubs for crack indications, and removal from service and replacement if necessary, and for certain serial numbers, removal from service and replacement of the HPT 1st-stage air seal. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jun 6, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-10332, comments due Jul 21, 2025 (https://www.federalregister.gov/documents/2025/06/06/2025-10332/airworthiness-directives-pratt-and-whitney-division-engines)

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