# Proposed AD FAA-2017-0719: Pratt & Whitney Division

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2018-02-10
- Products: Pratt & Whitney Division
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 25, 2017, 82 FR 40514
- Comments due: September 25, 2017
- Became: [AD 2018-02-10](https://openairdocs.org/ad/2018-02-10)
- Docket: FAA-2017-0719 (https://www.regulations.gov/docket/FAA-2017-0719, where comments are filed)
- FR document: 2017-17827
- Official PDF: https://openairdocs.org/files/sha256/74/d4/74d4e52fc6ade68d6b3d4a69327c6f34fa1bd45dafa07bffe71ab4b403f91c60 (from https://www.govinfo.gov/content/pkg/FR-2017-08-25/pdf/2017-17827.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/08/25/2017-17827/airworthiness-directives-pratt-and-whitney-division
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/224D058B46F7656E862581870052EE3E.0001
- Page: https://openairdocs.org/proposed/FAA-2017-0719

## Summary

We propose to adopt a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines. This proposed AD was prompted by the discovery of multiple cracked outer diffuser cases. This proposed AD would require initial and repetitive inspections to detect cracks in the outer diffuser case and removal from service of cases that fail inspection. We are proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 25, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-17827, comments due Sep 25, 2017 (https://www.federalregister.gov/documents/2017/08/25/2017-17827/airworthiness-directives-pratt-and-whitney-division)

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