# Proposed AD 2001-NE-32-AD: General Electric Company GE90 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2002-01-12
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 27, 2001, 66 FR 49326
- Comments due: November 26, 2001
- Became: [AD 2002-01-12](https://openairdocs.org/ad/2002-01-12)
- Docket: 2001-NE-32-AD
- FR document: 01-24274
- Official PDF: https://openairdocs.org/files/sha256/35/cf/35cf192c9e37ae1ce667196806e8b0b69e32d384c498d469624829a99a182cb8 (from https://www.govinfo.gov/content/pkg/FR-2001-09-27/pdf/01-24274.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/09/27/01-24274/airworthiness-directives-general-electric-company-ge90-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4D8B5C44E6419A6286256AD40052CB14.0001
- Page: https://openairdocs.org/proposed/2001-NE-32-AD

## Summary

The Federal Aviation Administration (FAA) proposes to adopt a new airworthiness directive (AD) that is applicable to General Electric Company (GE) GE90 series turbofan engines. This proposal would require removing from service high pressure turbine (HPT) interstage seals, identified by GE as the pre-life-improved rotor (pre-LIR) configuration, and installing a new design, identified by GE as the life improved rotor (LIR) configuration seal. This proposal would also require a new lower life limit for the LIR configuration seal. This proposal is prompted by an uncontained engine failure which occurred during a factory development engine ground test. The actions specified by the proposed AD are intended to prevent failure of the HPT interstage seal that could result in an uncontained engine failure and damage to the airplane.

## Notices in this docket

- Sep 27, 2001: Notice of proposed rulemaking (NPRM). (first notice), FR document 01-24274, comments due Nov 26, 2001 (https://www.federalregister.gov/documents/2001/09/27/01-24274/airworthiness-directives-general-electric-company-ge90-series-turbofan-engines)

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