# Proposed AD FAA-2008-0752: Pratt & Whitney Canada (P&WC) JT15D-5; -5B; -5F; and -5R Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-24-10
- Products: Pratt & Whitney
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 22, 2008, 73 FR 49619
- Comments due: September 22, 2008
- Became: [AD 2008-24-10](https://openairdocs.org/ad/2008-24-10)
- Docket: FAA-2008-0752 (https://www.regulations.gov/docket/FAA-2008-0752, where comments are filed)
- Project: 2008-NE-22-AD
- FR document: E8-19390
- Official PDF: https://openairdocs.org/files/sha256/53/dd/53dd3ff240fb89940c67ed46b722b6904af3add2bf01dae7de463bf493b75c28 (from https://www.govinfo.gov/content/pkg/FR-2008-08-22/pdf/E8-19390.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/08/22/E8-19390/airworthiness-directives-pratt-and-whitney-canada-pandwc-jt15d-5--5b--5f-and--5r-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F1A367E212EE798C862574AD004702A4.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0752

## 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 follows:

There have been several reported incidents of high altitude, dual engine flameout on JT15D-5 engines powered aircraft operating in certain meteorological conditions. Subsequent to the investigation of incidents, review of the engine design has revealed that the Fuel Control Hydro Mechanical Unit (HMU) P3 servo can be exposed to excessive moisture and freezing.

We are proposing this AD to prevent engine flameout, and possible dual- engine flameout events, caused by excessive moisture and freezing in the P3 servo, during certain flight conditions.

## Notices in this docket

- Aug 22, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-19390, comments due Sep 22, 2008 (https://www.federalregister.gov/documents/2008/08/22/E8-19390/airworthiness-directives-pratt-and-whitney-canada-pandwc-jt15d-5--5b--5f-and--5r-turbofan-engines)

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