# Proposed AD FAA-2013-0186: General Electric Company Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-17-07
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 2, 2013, 78 FR 19628
- Comments due: June 3, 2013
- Became: [AD 2013-17-07](https://openairdocs.org/ad/2013-17-07)
- Docket: FAA-2013-0186 (https://www.regulations.gov/docket/FAA-2013-0186, where comments are filed)
- Project: 2013-NE-11-AD
- FR document: 2013-07546
- Official PDF: https://openairdocs.org/files/sha256/83/27/8327ea77d6b1a61a7ae7af0ee1fb73cf8ff832fc46f0cb7cd4ee8f718a9ae41e (from https://www.govinfo.gov/content/pkg/FR-2013-04-02/pdf/2013-07546.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/04/02/2013-07546/airworthiness-directives-general-electric-company-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5486FF7DF6217EFD86257B410046BFC6.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0186

## Summary

We propose to adopt a new airworthiness directive (AD) for certain General Electric Company (GE) GE90-76B, -85B, -90B, -94B, - 110B1, and -115B turbofan engines. This proposed AD was prompted by multiple reports of failure of certain stage 1 high-pressure turbine (HPT) stator shrouds due to accelerated corrosion and oxidation. This proposed AD would require initial and repetitive on-wing borescope inspections (BSIs) for corrosion and oxidation, of the affected stage 1 HPT stator shrouds, and removal from service before further flight, if the parts fail the inspection. We are proposing this AD to prevent failure of the stage 1 HPT stator shrouds, resulting in in-flight shutdown of one or more engines, loss of thrust control, and damage to the airplane.

## Notices in this docket

- Apr 2, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-07546, comments due Jun 3, 2013 (https://www.federalregister.gov/documents/2013/04/02/2013-07546/airworthiness-directives-general-electric-company-turbofan-engines)

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