# Proposed AD 2003-NE-01-AD: Pratt & Whitney JT9D-7R4 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-01-08
- Products: Pratt & Whitney
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 23, 2003, 68 FR 19962
- Comments due: June 23, 2003
- Became: [AD 2004-01-08](https://openairdocs.org/ad/2004-01-08)
- Docket: 2003-NE-01-AD
- FR document: 03-9984
- Official PDF: https://openairdocs.org/files/sha256/ff/3d/ff3da12a5b062ee270b2a63f9be19e510aae7cc0239075a35603a815c7c5d8d5 (from https://www.govinfo.gov/content/pkg/FR-2003-04-23/pdf/03-9984.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/04/23/03-9984/airworthiness-directives-pratt-and-whitney-jt9d-7r4-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E0913A1503D3F5FB86256D11005553E4.0001
- Page: https://openairdocs.org/proposed/2003-NE-01-AD

## Summary

The Federal Aviation Administration (FAA) proposes to supersede an existing airworthiness directive (AD) that is applicable to Pratt & Whitney (PW) JT9D-7R4 series turbofan engines. That AD currently requires modifications of the fan case assembly by installing a thicker one-piece fan case shield, and modifications of the outer front fan exit case assembly by installing ring segments. This proposal would require on JT9D-7R4 series turbofan engines with steel fan cases, replacement of the existing one-piece fan case shield with a thicker four-piece fan case shield and would add four fan case shield supports. This proposal is prompted by two uncontained full fan blade fracture events that resulted in penetration of the steel fan case and fan case shield. The actions specified by the proposed AD are intended to prevent uncontained fan blade failures, resulting in damage to the airplane.

## Notices in this docket

- Apr 23, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-9984, comments due Jun 23, 2003 (https://www.federalregister.gov/documents/2003/04/23/03-9984/airworthiness-directives-pratt-and-whitney-jt9d-7r4-series-turbofan-engines)

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