# Proposed AD FAA-2012-0546: Pratt & Whitney Division Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-22-16
- Products: Pratt & Whitney Division
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 11, 2012, 77 FR 40822
- Comments due: September 10, 2012
- Became: [AD 2012-22-16](https://openairdocs.org/ad/2012-22-16)
- Docket: FAA-2012-0546 (https://www.regulations.gov/docket/FAA-2012-0546, where comments are filed)
- Project: 2012-NE-15-AD
- FR document: 2012-16857
- Official PDF: https://openairdocs.org/files/sha256/42/d5/42d53c6a6e3c4e0d3d691568dc32dee97a2bd30639a4e906c5b61e6ea5ce0053 (from https://www.govinfo.gov/content/pkg/FR-2012-07-11/pdf/2012-16857.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/07/11/2012-16857/airworthiness-directives-pratt-and-whitney-division-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8293748BC66ED58A86257A38004E7A69.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0546

## Summary

We propose to adopt a new airworthiness directive (AD) for all Pratt & Whitney PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4160, PW4460, PW4462, and PW4650 turbofan engines, including models with any dash number suffix. This proposed AD was prompted by 16 reports of damaged or failed 3rd stage low-pressure turbine (LPT) duct segments. This proposed AD would require removing from service certain part numbers (P/Ns) of 3rd stage LPT duct segments. We are proposing this AD to prevent failure of the 3rd stage LPT duct segments, which could lead to LPT rotor damage, uncontained engine failure, and damage to the airplane.

## Notices in this docket

- Jul 11, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-16857, comments due Sep 10, 2012 (https://www.federalregister.gov/documents/2012/07/11/2012-16857/airworthiness-directives-pratt-and-whitney-division-turbofan-engines)

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