# Proposed AD FAA-2020-0494: General Electric Company Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-18-14
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 18, 2020, 85 FR 29676
- Comments due: July 2, 2020
- Became: [AD 2020-18-14](https://openairdocs.org/ad/2020-18-14)
- Docket: FAA-2020-0494 (https://www.regulations.gov/docket/FAA-2020-0494, where comments are filed)
- Project: AD-2020-00324-E
- FR document: 2020-10571
- Official PDF: https://openairdocs.org/files/sha256/be/6c/be6c3391ea393238b6d9a90c32da6d86a97b6ff60caed738cb5b69bf0c49cb36 (from https://www.govinfo.gov/content/pkg/FR-2020-05-18/pdf/2020-10571.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/05/18/2020-10571/airworthiness-directives-general-electric-company-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A49A746C937892178625856C004427C6.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0494

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all General Electric Company (GE) GE90-110B1 and GE90-115B model turbofan engines with a certain high-pressure turbine (HPT) rotor stage 2 disk installed. This proposed AD was prompted by a report from the manufacturer that a subsurface anomaly was found on a HPT rotor stage 2 disk. This proposed AD would require an ultrasonic inspection (USI) of the HPT rotor stage 2 disk and, depending on the result of the inspection, replacement of the HPT rotor stage 2 disk with a part eligible for installation. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- May 18, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-10571, comments due Jul 2, 2020 (https://www.federalregister.gov/documents/2020/05/18/2020-10571/airworthiness-directives-general-electric-company-turbofan-engines)

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