# Airworthiness Directives; Pratt & Whitney Corp. (PW) JT9D-7R4H1 Turbofan Engines
> **Rule** · Final rule. · Published 2011-12-12 · Effective 2012-01-17 · 76 FR 77107
## Document
- **Document number:** 2011-31342
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney Corp. (PW) JT9D-7R4H1 Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 76 FR 77107
- **Publication date:** 2011-12-12
- **Effective date:** 2012-01-17
- **FAA docket:** Docket No. FAA-2011-0731
## Abstract

We are adopting a new airworthiness directive (AD) for all PW JT9D-7R4H1 turbofan engines. This AD was prompted by reports of cracks in five high-pressure compressor (HPC) shafts. This AD requires removing certain HPC shafts before their certified life limits and establishes a new, lower life-limit for these parts. We are issuing this AD to correct the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/12/12/2011-31342/airworthiness-directives-pratt-and-whitney-corp-pw-jt9d-7r4h1-turbofan-engines)
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