# Airworthiness Directives; General Electric Company GE90-76B; GE90-77B; GE90-85B; GE90-90B; and GE90-94B Turbofan Engines
> **Rule** · Final rule. · Published 2011-07-14 · Effective 2011-08-18 · 76 FR 41395
## Document
- **Document number:** 2011-17621
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 76 FR 41395
- **Publication date:** 2011-07-14
- **Effective date:** 2011-08-18
- **FAA docket:** Docket No. FAA-2010-1024
## Abstract

We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires initial and repetitive fluorescent penetrant inspections (FPIs) and eddy current inspections (ECIs) of the high-pressure compressor rotor (HPCR) 8-10 stage spool, part numbers (P/Ns) 1844M90G01 and 1844M90G02, for cracks between the 9-10 stages at each piece-part exposure. This AD was prompted by cracks discovered on one HPCR 8-10 spool between the 9-10 stages in the weld joint. We are issuing this AD to prevent failure of the HPCR 8-10 stage spool, uncontained engine failure, and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/07/14/2011-17621/airworthiness-directives-general-electric-company-ge90-76b-ge90-77b-ge90-85b-ge90-90b-and-ge90-94b)
---
*AI Analytics · CC0 1.0*