# Proposed AD FAA-2021-0273: General Electric Company Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-21-05
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 16, 2021, 86 FR 20094
- Comments due: June 1, 2021
- Became: [AD 2021-21-05](https://openairdocs.org/ad/2021-21-05)
- Docket: FAA-2021-0273 (https://www.regulations.gov/docket/FAA-2021-0273, where comments are filed)
- Project: AD-2021-00050-E
- FR document: 2021-07550
- Official PDF: https://openairdocs.org/files/sha256/44/f8/44f875ae5aa197c3649b53ed9c965109d2001019651fdcab577e8e808d3be1dc (from https://www.govinfo.gov/content/pkg/FR-2021-04-16/pdf/2021-07550.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/04/16/2021-07550/airworthiness-directives-general-electric-company-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8E57F970E9D86618862586B900711D37.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0273

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all General Electric Company (GE) GEnx-1B64, GEnx-1B64/P1, GEnx- 1B64/P2, GEnx-1B67, GEnx-1B67/P1, GEnx-1B67/P2, GEnx-1B70, GEnx-1B70/ 75/P1, GEnx-1B70/75/P2, GEnx-1B70/P1, GEnx-1B70/P2, GEnx-1B70C/P1, GEnx-1B70C/P2, GEnx-1B74/75/P1, GEnx-1B74/75/P2, GEnx-1B76/P2, GEnx- 1B76A/P2, GEnx-2B67, GEnx-2B67/P, and GEnx-2B67B model turbofan engines. This proposed AD was prompted by an in-service occurrence of loss of engine thrust control resulting in uncommanded high thrust. This proposed AD would require revising the operator's existing FAA- approved minimum equipment list (MEL) by incorporating into the MEL the dispatch restrictions listed in this AD. This proposed AD would also require initial and repetitive replacement of the electronic engine control (EEC) MN4 microprocessor. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 16, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-07550, comments due Jun 1, 2021 (https://www.federalregister.gov/documents/2021/04/16/2021-07550/airworthiness-directives-general-electric-company-turbofan-engines)

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