# Proposed AD FAA-2008-0759: Pratt & Whitney (PW) JT9D-7 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-04-18
- Products: Pratt & Whitney
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 10, 2008, 73 FR 39627
- Comments due: September 8, 2008
- Became: [AD 2009-04-18](https://openairdocs.org/ad/2009-04-18)
- Docket: FAA-2008-0759 (https://www.regulations.gov/docket/FAA-2008-0759, where comments are filed)
- Project: 2008-NE-02-AD
- FR document: E8-15682
- Official PDF: https://openairdocs.org/files/sha256/14/cb/14cb30e5eb6264eacf35f1ca85016c4b2d06263c475c5fd2168a3c4e1eb1ef0d (from https://www.govinfo.gov/content/pkg/FR-2008-07-10/pdf/E8-15682.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/07/10/E8-15682/airworthiness-directives-pratt-and-whitney-pw-jt9d-7-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8652AB5AD52DD5708625748300534D07.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0759

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for PW models JT9D-7, -7A, -7AH, -7H, -7F, and -7J turbofan engines. This proposed AD would require initial and repetitive borescope inspections of the 2nd stage high-pressure turbine (HPT) rotor and stator assembly. This proposed AD results from an uncontained failure of a 2nd stage HPT rotor disk that caused the engine to separate from the airplane. We are proposing this AD to prevent failure of the 2nd stage HPT rotor disk, which could result in uncontained engine failure, damage to the airplane, and the engine separating from the airplane.

## Notices in this docket

- Jul 10, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-15682, comments due Sep 8, 2008 (https://www.federalregister.gov/documents/2008/07/10/E8-15682/airworthiness-directives-pratt-and-whitney-pw-jt9d-7-series-turbofan-engines)

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