# Proposed AD FAA-2020-0733: General Electric Company Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-21-13
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 13, 2020, 85 FR 49322
- Comments due: September 14, 2020
- Became: [AD 2020-21-13](https://openairdocs.org/ad/2020-21-13)
- Docket: FAA-2020-0733 (https://www.regulations.gov/docket/FAA-2020-0733, where comments are filed)
- Project: AD-2020-00990-E
- FR document: 2020-17594
- Official PDF: https://openairdocs.org/files/sha256/ba/60/ba608646232e5a98b48b1f9cb6528ec642addae46b29ee5b3c9e0c6400b5b929 (from https://www.govinfo.gov/content/pkg/FR-2020-08-13/pdf/2020-17594.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/08/13/2020-17594/airworthiness-directives-general-electric-company-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/23D507CDE03994E1862585C30041BF5B.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0733

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain General Electric Company (GE) GE90-110B1 and GE90-115B model turbofan engines. This proposed AD was prompted by the detection of melt-related freckles in the billet, which may reduce the life limits of certain high-pressure turbine (HPT) rotor stage 2 disks and certain rotating compressor discharge pressure (CDP) HPT seals. This proposed AD would require replacement of the affected HPT rotor stage 2 disks and rotating CDP HPT seals. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 13, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-17594, comments due Sep 14, 2020 (https://www.federalregister.gov/documents/2020/08/13/2020-17594/airworthiness-directives-general-electric-company-turbofan-engines)

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