# Proposed AD FAA-2023-2523: Pratt & Whitney Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2024-06-04
- Products: Pratt & Whitney
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 9, 2024, 89 FR 1038
- Comments due: February 8, 2024
- Became: [AD 2024-06-04](https://openairdocs.org/ad/2024-06-04)
- Docket: FAA-2023-2523 (https://www.regulations.gov/docket/FAA-2023-2523, where comments are filed)
- Project: AD-2023-01086-E
- FR document: 2024-00309
- Official PDF: https://openairdocs.org/files/sha256/ee/6c/ee6c81d17e99608bafd931acd026cd5ac1449086133f3bf7d185c0c8d844dceb (from https://www.govinfo.gov/content/pkg/FR-2024-01-09/pdf/2024-00309.pdf)
- Federal Register: https://www.federalregister.gov/documents/2024/01/09/2024-00309/airworthiness-directives-pratt-and-whitney-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2024-00309-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2023-2523

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Pratt & Whitney (PW) Model PW1519G, PW1521G, PW1521GA, PW1521G-3, PW1524G, PW1524G-3, PW1525G, PW1525G-3, PW1919G, PW1921G, PW1922G, PW1923G, and PW1923G-A engines. This proposed AD was prompted by an updated 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 engine shutdown and aborted takeoff. This proposed AD would require performing an angled ultrasonic inspection (AUSI) of certain high-pressure turbine (HPT) 1st-stage hubs, HPT 2nd-stage hubs, and HPC 8th-stage disks for cracks and, depending on the results of the inspections, replacing the HPT 1st- stage hubs, HPT 2nd-stage hubs, or HPC 8th-stage disks. This proposed AD would also require accelerated replacement of certain HPC 7th-stage rotors, HPC 8th-stage disks, HPC rear hubs, HPT 1st-stage hubs, HPT 2nd-stage hubs, HPT 1st-stage air seals, HPT 2nd-stage air seals, HPT 1st-stage blade retaining plates, and HPT 2nd-stage blade retaining plates. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jan 9, 2024: Notice of proposed rulemaking (NPRM). (first notice), FR document 2024-00309, comments due Feb 8, 2024 (https://www.federalregister.gov/documents/2024/01/09/2024-00309/airworthiness-directives-pratt-and-whitney-turbofan-engines)

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