# Airworthiness Directives; Pratt & Whitney (PW) PW4000 Series Turbofan Engines
> **Rule** · Final rule. · Published 2010-09-13 · Effective 2010-10-18 · 75 FR 55459
## Document
- **Document number:** 2010-21869
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney (PW) PW4000 Series Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 75 FR 55459
- **Publication date:** 2010-09-13
- **Effective date:** 2010-10-18
- **FAA docket:** Docket No. FAA-2010-0217
## Abstract

The FAA is adopting a new airworthiness directive (AD) for PW PW4052, PW4056, PW4060, PW4062, PW4062A, PW4074, PW4077, PW4077D, PW4084D, PW4090, PW4090-3, PW4152, PW4156A, PW4158, PW4164, PW4168, PW4168A, PW4460, and PW4462 turbofan engines. This AD requires initial and repetitive fluorescent penetrant inspections (FPI) for cracks in the blade locking and loading slots of the high-pressure compressor (HPC) drum rotor disk assembly. This AD results from reports of cracked locking and loading slots in the HPC drum rotor disk assembly. We are issuing this AD to detect cracks in the locking and loading slots in the HPC drum rotor disk assemblies, which could result in rupture of the HPC drum rotor disk assembly and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/09/13/2010-21869/airworthiness-directives-pratt-and-whitney-pw-pw4000-series-turbofan-engines)
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