# Proposed AD FAA-2013-0475: General Electric Company Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-23-14
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 5, 2013, 78 FR 47235
- Comments due: October 4, 2013
- Became: [AD 2013-23-14](https://openairdocs.org/ad/2013-23-14)
- Docket: FAA-2013-0475 (https://www.regulations.gov/docket/FAA-2013-0475, where comments are filed)
- Project: 13-NE-18-AD
- FR document: 2013-18794
- Official PDF: https://openairdocs.org/files/sha256/2c/1e/2c1e3b00a3e97f6c5c123b3fd4163826715b37dae074583c4fcabd2f44f564da (from https://www.govinfo.gov/content/pkg/FR-2013-08-05/pdf/2013-18794.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/08/05/2013-18794/airworthiness-directives-general-electric-company-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/78790E7478CE3A2A86257BBE004BE001.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0475

## Summary

We propose to adopt a new airworthiness directive (AD) for certain General Electric Company (GE) model GEnx-2B67 and GEnx-2B67B turbofan engines. This proposed AD was prompted by the original equipment manufacturer's disclosure that certain critical rotating life-limited parts (LLPs) used in Boeing 747-8 flight tests had consumed more cyclic life than they would have in revenue flight cycles. These parts were then installed into engines and introduced into revenue service without adjustment to remaining cyclic life. This proposed AD would require a one-time adjustment to the cycle counts of those LLPs to account for the additional low cycle fatigue (LCF) life consumed during flight tests. We are proposing this AD to prevent the failure of critical rotating LLPs, uncontained engine failure, and damage to the airplane.

## Notices in this docket

- Aug 5, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-18794, comments due Oct 4, 2013 (https://www.federalregister.gov/documents/2013/08/05/2013-18794/airworthiness-directives-general-electric-company-turbofan-engines)

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