# Airworthiness Directives; Pratt & Whitney Models PW2037, PW2037(M), and PW2040 Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2009-07-08 · Effective 2009-07-23 · 74 FR 32421
## Document
- **Document number:** E9-15398
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 74 FR 32421
- **Publication date:** 2009-07-08
- **Effective date:** 2009-07-23
- **FAA docket:** Docket No. FAA-2009-0417
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney models PW2037, PW2037(M), and PW2040 turbofan engines. This AD requires 12th stage disks of certain high-pressure compressor (HPC) drum rotor disk assemblies, to be inspected for cracks by Pratt & Whitney using a special eddy current inspection procedure. This AD results from six HPC 12th stage disks found cracked during HPC module disassembly at overhaul. We are issuing this AD to prevent uncontained failure of the HPC 12th stage disk and airplane damage.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/07/08/E9-15398/airworthiness-directives-pratt-and-whitney-models-pw2037-pw2037m-and-pw2040-turbofan-engines)
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