# Proposed AD FAA-2012-0060: Pratt & Whitney (PW) Division Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-14-09
- Products: Pratt & Whitney Division
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 2, 2012, 77 FR 12755
- Comments due: May 1, 2012
- Became: [AD 2012-14-09](https://openairdocs.org/ad/2012-14-09)
- Docket: FAA-2012-0060 (https://www.regulations.gov/docket/FAA-2012-0060, where comments are filed)
- Project: 2012-NE-02-AD
- FR document: 2012-5094
- Official PDF: https://openairdocs.org/files/sha256/a6/b2/a6b2ac8f30078b5b3b349d6868bb86defc4e9530fdeba16eb9d93de82df9b642 (from https://www.govinfo.gov/content/pkg/FR-2012-03-02/pdf/2012-5094.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/03/02/2012-5094/airworthiness-directives-pratt-and-whitney-pw-division-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BC9C2B16DF4E0E47862579B5004C386A.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0060

## Summary

We propose to adopt a new airworthiness directive (AD) for certain PW4000 series turbofan engines. This proposed AD was prompted by reports of 3rd and 4th stage vane fractures in the low pressure turbine (LPT) of certain PW4000-94'' and PW4000-100'' turbofan engines. These fractures caused an uncontained engine failure, an LPT case puncture, and multiple in flight shutdowns. We are proposing this AD to prevent 3rd and 4th stage vane fractures in the LPT, which could damage the LPT rotor and lead to an uncontained engine failure and damage to the airplane.

## Notices in this docket

- Mar 2, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-5094, comments due May 1, 2012 (https://www.federalregister.gov/documents/2012/03/02/2012-5094/airworthiness-directives-pratt-and-whitney-pw-division-turbofan-engines)

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