# Proposed AD FAA-2020-0542: Pratt & Whitney Division Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-25-09
- Products: Pratt & Whitney Division
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 12, 2020, 85 FR 35812
- Comments due: July 27, 2020
- Became: [AD 2020-25-09](https://openairdocs.org/ad/2020-25-09)
- Docket: FAA-2020-0542 (https://www.regulations.gov/docket/FAA-2020-0542, where comments are filed)
- Project: AD-2020-00582-E
- FR document: 2020-12626
- Official PDF: https://openairdocs.org/files/sha256/4d/cc/4dcc86e3d5d68744ca4d96f7f5c28625696f5ec9f14d704a8d2b26ae84203211 (from https://www.govinfo.gov/content/pkg/FR-2020-06-12/pdf/2020-12626.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/06/12/2020-12626/airworthiness-directives-pratt-and-whitney-division-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/22481A6339B06C8986258585003FE339.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0542

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) PW4164, PW4164-1D, PW4168, PW4168-1D, PW4168A, PW4168A-1D, and PW4170 model turbofan engines with a certain outer combustion chamber assembly and 3rd stage low-pressure turbine (LPT) duct segments installed. This proposed AD was prompted by reports of damaged or failed 3rd stage LPT duct segments on PW engines with the Talon IIB outer combustion chamber assembly configuration installed. This proposed AD would require removing and replacing certain 3rd stage LPT duct segments. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jun 12, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-12626, comments due Jul 27, 2020 (https://www.federalregister.gov/documents/2020/06/12/2020-12626/airworthiness-directives-pratt-and-whitney-division-turbofan-engines)

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