# Proposed AD FAA-2010-0246: Pratt & Whitney Canada Corp. PW617F-E Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-17-01
- Products: Pratt & Whitney Canada
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 17, 2010, 75 FR 27491
- Comments due: July 1, 2010
- Became: [AD 2010-17-01](https://openairdocs.org/ad/2010-17-01)
- Docket: FAA-2010-0246 (https://www.regulations.gov/docket/FAA-2010-0246, where comments are filed)
- Project: 2010-NE-16-AD
- FR document: 2010-11645
- Official PDF: https://openairdocs.org/files/sha256/87/9e/879eefd316a654b190dc7e52863894260ba1437185d34f94c722558416c4df09 (from https://www.govinfo.gov/content/pkg/FR-2010-05-17/pdf/2010-11645.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/05/17/2010-11645/airworthiness-directives-pratt-and-whitney-canada-corp-pw617f-e-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D11EED8E79B8CD7786257727004C8BC7.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0246

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

A PW617F-E engine powered twin engined aircraft had recently experienced an uncommanded power reduction on one of its engines. Investigation showed that the Fuel Filter Bypass Valve poppet in the Fuel Oil Heat Exchanger (FOHE) on that engine had worn through the housing seat, allowing unfiltered fuel and debris to contaminate the Fuel Metering Unit (FMU), resulting in fuel flow drop and subsequent power reduction. Pratt & Whitney Canada Corp. issued an Alert Service Bulletin (ASB) No. PW600-72-A66019 to inspect and replace any discrepant valve with the same type new valve. The inspection results confirmed that failure of a worn through poppetis dormant and it can affect both engines at the same time that could result in an unsafe condition on PW617F-E powered aircraft.

We are proposing this AD to prevent uncommanded power reduction, which could result in the inability to continue safe flight and safe landing.

## Notices in this docket

- May 17, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-11645, comments due Jul 1, 2010 (https://www.federalregister.gov/documents/2010/05/17/2010-11645/airworthiness-directives-pratt-and-whitney-canada-corp-pw617f-e-turbofan-engines)

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