# Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines
> **Rule** · Final rule. · Published 2007-03-08 · Effective 2007-04-12 · 72 FR 10350
## Document
- **Document number:** E7-4139
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney JT9D Series Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 72 FR 10350
- **Publication date:** 2007-03-08
- **Effective date:** 2007-04-12
- **FAA docket:** Docket No. FAA-2007-27023
## Abstract

The FAA is superseding 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 AD modifies 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. This AD results from the need to require enhanced inspection of selected critical life- limited parts of JT9D series turbofan engines. We are issuing this AD to prevent critical life-limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/03/08/E7-4139/airworthiness-directives-pratt-and-whitney-jt9d-series-turbofan-engines)
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