# Proposed AD FAA-2018-0826: Pratt & Whitney Division (PW) Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2019-03-01
- Products: Pratt & Whitney Division
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 10, 2018, 83 FR 50862
- Comments due: November 26, 2018
- Became: [AD 2019-03-01](https://openairdocs.org/ad/2019-03-01)
- Docket: FAA-2018-0826 (https://www.regulations.gov/docket/FAA-2018-0826, where comments are filed)
- FR document: 2018-21694
- Official PDF: https://openairdocs.org/files/sha256/1f/ea/1feabe02a073685b395adb488959dcb9f2942a718a79dce197ae2347d800ee36 (from https://www.govinfo.gov/content/pkg/FR-2018-10-10/pdf/2018-21694.pdf)
- Federal Register: https://www.federalregister.gov/documents/2018/10/10/2018-21694/airworthiness-directives-pratt-and-whitney-division-pw-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B5ED2D24DDC3835B862583220046A9A5.0001
- Page: https://openairdocs.org/proposed/FAA-2018-0826

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Pratt & Whitney Division (PW) PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines. This proposed AD was prompted by an in-flight failure of a 1st stage low-pressure compressor (LPC) blade. This proposed AD would require initial and repetitive thermal acoustic imaging (TAI) inspections for cracks in certain 1st stage LPC blades and removal of those blades that fail inspection. We are proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Oct 10, 2018: Notice of proposed rulemaking (NPRM). (first notice), FR document 2018-21694, comments due Nov 26, 2018 (https://www.federalregister.gov/documents/2018/10/10/2018-21694/airworthiness-directives-pratt-and-whitney-division-pw-turbofan-engines)

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