# Proposed AD FAA-2025-3998: General Electric Company Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2026-21-11
- Products: General Electric Company GE Aerospace
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 18, 2025, 90 FR 51590
- Comments due: January 2, 2026
- Became: [AD 2026-21-11](https://openairdocs.org/ad/2026-21-11)
- Docket: FAA-2025-3998 (https://www.regulations.gov/docket/FAA-2025-3998, where comments are filed)
- Project: AD-2025-00432-E
- FR document: 2025-20089
- Official PDF: https://openairdocs.org/files/sha256/10/c2/10c286a34ee51c095471a5b7615bec438fae759d879162091d778a5523ec0d09 (from https://www.govinfo.gov/content/pkg/FR-2025-11-18/pdf/2025-20089.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/11/18/2025-20089/airworthiness-directives-general-electric-company-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-20089-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-3998

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain General Electric Company (GE) Model CF34-8C1, CF34-8C5, CF34-8C5A1, CF34-8C5A2, CF34-8C5B1, CF34-8E2, CF34-8E2A1, CF34-8E5, CF34-8E5A1, CF34-8E5A2, CF34-8E5A2HA, CF34-8E6, and CF34-8E6A1 engines. This proposed AD was prompted by reports of in-flight "Engine Degraded" messages from the engine indicating and crew alerting system (EICAS) due to corrosion of the variable geometry (VG) system actuator. This proposed AD would require removing certain electronic engine control (EEC) full authority digital electronic control (FADEC) software versions from service and installing an updated EEC FADEC software that is eligible for installation. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Nov 18, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-20089, comments due Jan 2, 2026 (https://www.federalregister.gov/documents/2025/11/18/2025-20089/airworthiness-directives-general-electric-company-engines)

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