# Proposed AD FAA-2021-0347: General Electric Company Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-15-05
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 7, 2021, 86 FR 24554
- Comments due: June 21, 2021
- Became: [AD 2021-15-05](https://openairdocs.org/ad/2021-15-05)
- Docket: FAA-2021-0347 (https://www.regulations.gov/docket/FAA-2021-0347, where comments are filed)
- Project: AD-2020-01610-E
- FR document: 2021-09291
- Official PDF: https://openairdocs.org/files/sha256/f1/39/f1390f4c71dc1632ed24fa885416db978fd7152c4669a623d14b3ec5fcbc282e (from https://www.govinfo.gov/content/pkg/FR-2021-05-07/pdf/2021-09291.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/05/07/2021-09291/airworthiness-directives-general-electric-company-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/271C07974D311679862586D1005EBCBD.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0347

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all General Electric Company GE90-110B1 and GE90-115B 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 initial and repetitive replacement of the full authority digital engine control (FADEC) integrated circuit (MN4) microprocessor. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- May 7, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-09291, comments due Jun 21, 2021 (https://www.federalregister.gov/documents/2021/05/07/2021-09291/airworthiness-directives-general-electric-company-turbofan-engines)

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