# Proposed AD FAA-2022-1240: General Electric Company Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2023-05-17
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 14, 2022, 87 FR 68113
- Comments due: December 29, 2022
- Became: [AD 2023-05-17](https://openairdocs.org/ad/2023-05-17)
- Docket: FAA-2022-1240 (https://www.regulations.gov/docket/FAA-2022-1240, where comments are filed)
- Project: AD-2022-00683-E
- FR document: 2022-23911
- Official PDF: https://openairdocs.org/files/sha256/47/d4/47d49f2683e9e8f2a4837c10f3aab29230d374bbb090d91abb6352eba46ef324 (from https://www.govinfo.gov/content/pkg/FR-2022-11-14/pdf/2022-23911.pdf)
- Federal Register: https://www.federalregister.gov/documents/2022/11/14/2022-23911/airworthiness-directives-general-electric-company-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2022-23911-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2022-1240

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain General Electric Company (GE) GE90-76B, GE90-85B, GE90-90B, and GE90-94B model turbofan engines. This proposed AD was prompted by a commanded in-flight shutdown (IFSD) due to cracking and rockback of the high-pressure turbine (HPT) stage 2 nozzles resulting in blade liberation, severe rotor imbalance, and liberation of the exhaust centerbody. This proposed AD would require initial and repetitive borescope inspections (BSIs) of the forward platforms of the HPT stage 2 blades or the leading edges of the HPT stage 2 nozzles and, depending on the results of the inspections, removal and replacement of the HPT stage 2 nozzles with a part eligible for installation. As a mandatory terminating action to the repetitive BSIs of the forward platforms of the HPT stage 2 blades or the leading edges of the HPT stage 2 nozzles, this proposed AD would require replacement of the HPT stage 2 nozzles. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Nov 14, 2022: Notice of proposed rulemaking (NPRM). (first notice), FR document 2022-23911, comments due Dec 29, 2022 (https://www.federalregister.gov/documents/2022/11/14/2022-23911/airworthiness-directives-general-electric-company-turbofan-engines)

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