# Proposed AD FAA-2020-0850: General Electric Company Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-11-07
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 24, 2020, 85 FR 60103
- Comments due: November 9, 2020
- Became: [AD 2021-11-07](https://openairdocs.org/ad/2021-11-07)
- Docket: FAA-2020-0850 (https://www.regulations.gov/docket/FAA-2020-0850, where comments are filed)
- Project: AD-2020-00288-E
- FR document: 2020-20947
- Official PDF: https://openairdocs.org/files/sha256/2d/ed/2dedb496bbf3aa78d0a26e8bd84602abd22c2deba2fc470a133a6632875f4772 (from https://www.govinfo.gov/content/pkg/FR-2020-09-24/pdf/2020-20947.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/09/24/2020-20947/airworthiness-directives-general-electric-company-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/019E81D25E6C718F862585ED004EA8E1.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0850

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain GEnx-1B64, 1B64/P1, -1B64/P2, -1B67, -1B67/P1, -1B67/P2, - 1B70, -1B70/75/P1, -1B70/75/P2, -1B70/P1, -1B70/P2, -1B70C/P1, -1B70C/ P2, -1B74/75/P1, -1B74/75/P2, -1B76/P2, -1B76A/P2, -2B67, -2B67/P, and -2B67B model turbofan engines. This proposed AD was prompted by a finding during an inspection by the manufacturer that two stages 6-10 compressor rotor spools in the high-pressure compressor (HPC) assembly were damaged at similar locations. Additionally, the manufacturer reported that certain stages 6-10 compressor rotor spool webs did not undergo a required fluorescent penetrant inspection (FPI) during production. This proposed AD would require inspection of the stages 6- 10 compressor rotor spool and, depending on the result of the inspection, replacement of the stages 6-10 compressor rotor spool with a part eligible for installation. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Sep 24, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-20947, comments due Nov 9, 2020 (https://www.federalregister.gov/documents/2020/09/24/2020-20947/airworthiness-directives-general-electric-company-turbofan-engines)

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