# Airworthiness Directives; General Electric Company Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2022-04-14 · Effective 2022-04-29 · 87 FR 22122
## Document
- **Document number:** 2022-08037
- **Category:** airworthiness
- **Manufacturer:** General Electric Company Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 87 FR 22122
- **Publication date:** 2022-04-14
- **Effective date:** 2022-04-29
- **FAA docket:** Docket No. FAA-2022-0400
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) CF34-8C and CF34-8E model turbofan engines. This AD was prompted by an "Engine Degraded" message received in-flight from the Engine Indicating and Crew Alerting System (EICAS), and a subsequent investigation by the manufacturer that revealed corrosion of the variable geometry (VG) system actuator, which can cause the full authority digital engine control (FADEC) software to command and lock the engine at idle until it is restarted. This AD requires performing a rotational torque check on the actuating linkage assembly and, depending on the results of the rotational torque check, replacement of the compressor inlet guide vane (IGV) outer shroud bushing and vane spindle bushing with parts eligible for installation. This AD also requires reporting the results of the rotational torque check to GE. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/04/14/2022-08037/airworthiness-directives-general-electric-company-turbofan-engines)
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