# Proposed AD FAA-2011-1194: Pratt & Whitney Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-06-18
- Products: Pratt & Whitney Division
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 23, 2011, 76 FR 72353
- Comments due: January 23, 2012
- Became: [AD 2012-06-18](https://openairdocs.org/ad/2012-06-18)
- Docket: FAA-2011-1194 (https://www.regulations.gov/docket/FAA-2011-1194, where comments are filed)
- Project: 2011-NE-36-AD
- FR document: 2011-30138
- Official PDF: https://openairdocs.org/files/sha256/3c/ff/3cff672cb5c7fa3dd0fb35ac5d02f899e96b6e2c2018df51aa698a9c619c9fc8 (from https://www.govinfo.gov/content/pkg/FR-2011-11-23/pdf/2011-30138.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/11/23/2011-30138/airworthiness-directives-pratt-and-whitney-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/44164286125BE06786257951004EF930.0001
- Page: https://openairdocs.org/proposed/FAA-2011-1194

## Summary

We propose to adopt a new airworthiness directive (AD) for all Pratt & Whitney PW4050, PW4052, PW4056, PW4056(-3), PW4156, PW4060, PW4060(- 3), PW4060A, PW4152, PW4152(-3), PW4156A, PW4158, PW4158(-3), PW4460, PW4460(-3), PW4462, and PW4462(-3) turbofan engines. This proposed AD was prompted by reports of five engine in-flight shutdowns and seven unplanned engine removals. This proposed AD would require inspections, cleaning, and engine modifications to address coking in the No. 4 bearing compartment and oil pressure and scavenge tubes. We are proposing this AD to prevent an engine fire, a fractured fan drive shaft, and damage to the airplane.

## Notices in this docket

- Nov 23, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-30138, comments due Jan 23, 2012 (https://www.federalregister.gov/documents/2011/11/23/2011-30138/airworthiness-directives-pratt-and-whitney-turbofan-engines)

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