# Proposed AD 98-ANE-47-AD: Pratt & Whitney JT9D Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-01-13
- Products: Pratt & Whitney
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 2, 2005, 70 FR 66300
- Comments due: January 3, 2006
- Became: [AD 2000-01-13](https://openairdocs.org/ad/2000-01-13)
- Docket: 98-ANE-47-AD
- FR document: 05-21804
- Official PDF: https://openairdocs.org/files/sha256/ac/2c/ac2c1fb9831371c3c0b9f245350729aa303a5ce4c45e8390fc4c65f923d9e6da (from https://www.govinfo.gov/content/pkg/FR-2005-11-02/pdf/05-21804.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/11/02/05-21804/airworthiness-directives-pratt-and-whitney-jt9d-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/60169C9DBC550F8A862570AD0065B2AC.0001
- Page: https://openairdocs.org/proposed/98-ANE-47-AD

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) for Pratt & Whitney (PW) JT9D series turbofan engines. That AD currently requires revisions to the Airworthiness Limitations Section (ALS) of the manufacturer's Instructions for Continued Airworthiness (ICA) to include required enhanced inspection of selected critical life-limited parts at each piece-part opportunity. This proposed AD would modify the JT9D series engines ALS sections of the manufacturer's manuals and an air carrier's approved continuous airworthiness maintenance program to incorporate additional inspection requirements. The mandatory inspections are needed to identify those critical rotating parts with conditions, which if allowed to continue in service, could result in uncontained failures. We are proposing this AD to prevent critical life-limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane.

## Notices in this docket

- Jul 28, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-19631, comments due Oct 26, 1998 (https://www.federalregister.gov/documents/1998/07/28/98-19631/airworthiness-directives-pratt-and-whitney-jt9d-series-turbofan-engines)
- Aug 16, 1999: Notice of proposed rulemaking (NPRM)., FR document 99-21178, comments due Sep 15, 1999 (https://www.federalregister.gov/documents/1999/08/16/99-21178/airworthiness-directives-pratt-and-whitney-jt9d-series-turbofan-engines)
- Oct 10, 2001: Notice of proposed rulemaking (NPRM)., FR document 01-25399, comments due Nov 9, 2001 (https://www.federalregister.gov/documents/2001/10/10/01-25399/airworthiness-directives-pratt-and-whitney-jt9d-series-turbofan-engines)
- Nov 20, 2001: Supplemental notice of proposed rulemaking; reopening of comment period., FR document 01-28707, comments due Dec 20, 2001 (https://www.federalregister.gov/documents/2001/11/20/01-28707/airworthiness-directives-pratt-and-whitney-jt9d-series-turbofan-engines)
- Nov 2, 2005: Notice of proposed rulemaking (NPRM)., FR document 05-21804, comments due Jan 3, 2006 (https://www.federalregister.gov/documents/2005/11/02/05-21804/airworthiness-directives-pratt-and-whitney-jt9d-series-turbofan-engines)

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