# Proposed AD FAA-2017-0817: Pratt & Whitney Division Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2018-13-02
- Products: Pratt & Whitney Division
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 12, 2017, 82 FR 47405
- Comments due: November 27, 2017
- Became: [AD 2018-13-02](https://openairdocs.org/ad/2018-13-02)
- Docket: FAA-2017-0817 (https://www.regulations.gov/docket/FAA-2017-0817, where comments are filed)
- FR document: 2017-21558
- Official PDF: https://openairdocs.org/files/sha256/5c/66/5c66bbb30ab66937ae311d90de2330c11e8758508ae7e7c89fe7374586ad0d1e (from https://www.govinfo.gov/content/pkg/FR-2017-10-12/pdf/2017-21558.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/10/12/2017-21558/airworthiness-directives-pratt-and-whitney-division-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9B1E1662E9745C65862581B7004EB826.0001
- Page: https://openairdocs.org/proposed/FAA-2017-0817

## Summary

We propose to adopt a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) PW4052, PW4056, PW4060, PW4062, PW4062A, PW4152, PW4156A, PW4158, PW4460, and PW4462 turbofan engine models, including engines identified with suffixes -1C, -1E, -3, -3A, or -3B. This proposed AD was prompted by the discovery of multiple cracked 4th stage low-pressure turbine (LPT) air seals in the fleet. This proposed AD requires removal from service of certain air seals. We are proposing this AD to correct the unsafe condition on these products.

## Notices in this docket

- Oct 12, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-21558, comments due Nov 27, 2017 (https://www.federalregister.gov/documents/2017/10/12/2017-21558/airworthiness-directives-pratt-and-whitney-division-turbofan-engines)

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