# Proposed AD FAA-2021-1167: General Electric Company Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-09-14
- Products: General Electric
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 29, 2021, 86 FR 73997
- Comments due: February 14, 2022
- Became: [AD 2022-09-14](https://openairdocs.org/ad/2022-09-14)
- Docket: FAA-2021-1167 (https://www.regulations.gov/docket/FAA-2021-1167, where comments are filed)
- Project: AD-2021-00823-E
- FR document: 2021-28134
- Official PDF: https://openairdocs.org/files/sha256/df/1e/df1ef61c58be389628bd74b3fe3d23fec28926fb30f7f87d24d5fc80e25c9535 (from https://www.govinfo.gov/content/pkg/FR-2021-12-29/pdf/2021-28134.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/12/29/2021-28134/airworthiness-directives-general-electric-company-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2021-28134-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2021-1167

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2019-22-05, which applies to all General Electric Company (GE) CF34-8C model turbofan engines. AD 2019-22-05 requires initial and repetitive inspections of the operability bleed valve (OBV) fuel tubes, OBV bleed air manifold link rod assemblies, and the OBV fuel fittings. AD 2019- 22-05 also requires replacement of OBVs or related OBV hardware that fail inspection. Since the FAA issued AD 2019-22-05, the manufacturer has redesigned the OBV, which terminates the need for the repetitive inspections. This proposed AD would require initial and repetitive inspections of the OBV fuel tubes, OBV bleed air manifold link rod assemblies, and the OBV fuel fittings. This proposed AD would also require replacement of OBVs or related OBV hardware that fail inspection. As a terminating action to the repetitive inspections, this proposed AD would require replacement of certain OBVs installed on GE CF34-8C and CF34-8E model turbofan engines. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Dec 29, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-28134, comments due Feb 14, 2022 (https://www.federalregister.gov/documents/2021/12/29/2021-28134/airworthiness-directives-general-electric-company-turbofan-engines)

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