# Proposed AD FAA-2020-0371: General Electric Company Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-03-02
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 10, 2020, 85 FR 20211
- Comments due: May 26, 2020
- Became: [AD 2021-03-02](https://openairdocs.org/ad/2021-03-02)
- Docket: FAA-2020-0371 (https://www.regulations.gov/docket/FAA-2020-0371, where comments are filed)
- Project: AD-2019-00124-E
- FR document: 2020-07565
- Official PDF: https://openairdocs.org/files/sha256/15/42/154244e16fe11b2d3d4865439141902b793d23c6bb5c4b9c940acd2f917d7958 (from https://www.govinfo.gov/content/pkg/FR-2020-04-10/pdf/2020-07565.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/04/10/2020-07565/airworthiness-directives-general-electric-company-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EAF3C58F661B9A53862585460040A13C.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0371

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all General Electric Company (GE) CF6-80C2A1, CF6-80C2A2, CF6- 80C2A3, CF6-80C2A5, CF6-80C2A5F, CF6-80C2A8, CF6-80C2B1, CF6-80C2B1F, CF6-80C2B2, CF6-80C2B2F, CF6-80C2B4, CF6-80C2B4F, CF6-80C2B5F, CF6- 80C2B6, CF6-80C2B6F, CF6-80C2B6FA, CF6-80C2B7F, CF6-80C2B8F, and CF6- 80C2D1F model turbofan engines. This proposed AD was prompted by reports of incidents that resulted in a significant fuel loss during flight and an in-flight shutdown (IFSD) of the engine. This proposed AD would require initial and repetitive shim checks of the hydromechanical unit/main engine control (HMU/MEC) idler adapter on the accessory gearbox (AGB) assembly and, depending on the results of the shim check, possible replacement of the inserts on the HMU/MEC idler adapter. As a terminating action to the repetitive shim checks, this proposed AD would also require a protrusion check and a pull-out test and replacements of inserts on the HMU/MECidler adapter that fail either test. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 10, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-07565, comments due May 26, 2020 (https://www.federalregister.gov/documents/2020/04/10/2020-07565/airworthiness-directives-general-electric-company-turbofan-engines)

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