# Proposed AD FAA-2011-0278: General Electric Company (GE) GE90- 110B1 and GE90-115B Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-26-11
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 26, 2011, 76 FR 30573
- Comments due: July 11, 2011
- Became: [AD 2011-26-11](https://openairdocs.org/ad/2011-26-11)
- Docket: FAA-2011-0278 (https://www.regulations.gov/docket/FAA-2011-0278, where comments are filed)
- Project: 2010-NE-10-AD
- FR document: 2011-13013
- Official PDF: https://openairdocs.org/files/sha256/93/cc/93cc18c5d6863a3c184b2662827dfd49c0a58f14aa921d75d98f65b99a5a2360 (from https://www.govinfo.gov/content/pkg/FR-2011-05-26/pdf/2011-13013.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/05/26/2011-13013/airworthiness-directives-general-electric-company-ge-ge90-110b1-and-ge90-115b-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/953C4A12B100DDCE8625789C004B0DB0.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0278

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above, with certain part number (P/N) high-pressure compressor (HPC) stages 2-5 spools installed. This proposed AD would require eddy current inspection (ECI) or spot fluorescent penetrant inspection (FPI) of the stages 1-2 rotating seal teeth of the HPC stages 2-5 spool for cracks and would prohibit installation of HPC stator stage 1 interstage seals that are not pregrooved to prevent heavy rubs. This proposed AD was prompted by an aborted takeoff and two shop findings of cracks in the stages 1-2 rotating seal teeth. We are proposing this AD to detect cracks in the HPC stages 1-2 rotating seal teeth due to heavy rubs, which could result in failure of the stages 1- 2 rotating seal of the HPC stages 2-5 spool, uncontained engine failure, and damage to the airplane.

## Notices in this docket

- May 26, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-13013, comments due Jul 11, 2011 (https://www.federalregister.gov/documents/2011/05/26/2011-13013/airworthiness-directives-general-electric-company-ge-ge90-110b1-and-ge90-115b-turbofan-engines)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.