# Airworthiness Directives; Pratt & Whitney (PW) Models PW4074 and PW4077 Turbofan Engines
> **Rule** · Final rule. · Published 2011-08-04 · Effective 2011-09-08 · 76 FR 47056
## Document
- **Document number:** 2011-19476
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney (PW) Models PW4074 and PW4077 Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 76 FR 47056
- **Publication date:** 2011-08-04
- **Effective date:** 2011-09-08
- **FAA docket:** Docket No. FAA-2010-1095
## Abstract

We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires removing the 15th stage HPC disk within 12,000 cycles since new (CSN) or, for any disks that exceed 12,000 CSN after the effective date of this AD using a drawdown plan that includes a borescope inspection (BSI) or eddy current inspection (ECI) of the rim for cracks. This AD was prompted by multiple shop findings of cracked 15th stage HPC disks. We are issuing this AD to prevent cracks from propagating into the disk bolt holes, which could result in a failure of the 15th stage HPC disk, uncontained engine failure, and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/08/04/2011-19476/airworthiness-directives-pratt-and-whitney-pw-models-pw4074-and-pw4077-turbofan-engines)
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