# Proposed AD FAA-2025-0627: GE Aviation Czech s.r.o. (Type Certificate Previously Held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2025-18-08
- Products: GE Aviation Czech s.r.o.
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 23, 2025, 90 FR 17022
- Comments due: June 9, 2025
- Became: [AD 2025-18-08](https://openairdocs.org/ad/2025-18-08)
- Docket: FAA-2025-0627 (https://www.regulations.gov/docket/FAA-2025-0627, where comments are filed)
- Project: MCAI-2024-00608-E
- FR document: 2025-06903
- Official PDF: https://openairdocs.org/files/sha256/c7/33/c73364ad7ddf618a58f513603f6429a0bdce93f04e1f8cba4a29cb8e5032d5c8 (from https://www.govinfo.gov/content/pkg/FR-2025-04-23/pdf/2025-06903.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/04/23/2025-06903/airworthiness-directives-ge-aviation-czech-sro-type-certificate-previously-held-by-walter-engines-as
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-06903-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-0627

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2024-06-02, which applies to all GE Aviation Czech s.r.o. (GEAC) Model M601D-11, M601E-11, M601E-11A, M601E-11AS, M601E-11S, and M601F engines. AD 2024-06-02 was prompted by a report of a crack on the centrifugal compressor case mount pad weld area caused by a non- conforming weld (lack of welding penetration). AD 2024-06-02 requires a one-time detailed visual inspection (DVI) of the compressor case pad welds for any crack, and replacement of the compressor case if necessary. Since the FAA issued AD 2024-06-02, the manufacturer determined that the compliance time for the DVI can be extended, and repetitive inspections of the centrifugal compressor case must be accomplished. This proposed AD would require performing repetitive DVIs of the compressor case pad welds for any crack, replacing the compressor case if necessary, and sending certain inspection results to the manufacturer, as specified in a European Union Aviation Safety Agency (EASA) AD, which is proposed for incorporation by reference. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 23, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-06903, comments due Jun 9, 2025 (https://www.federalregister.gov/documents/2025/04/23/2025-06903/airworthiness-directives-ge-aviation-czech-sro-type-certificate-previously-held-by-walter-engines-as)

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