# Airworthiness Directives; GE Aviation Czech s.r.o. (Type Certificate Previously Held by WALTER Engines a.s., Walter a.s., and MOTORLET a.s.) Turboprop Engines
> **Rule** · Final rule. · Published 2022-12-22 · Effective 2023-01-26 · 87 FR 78532
## Document
- **Document number:** 2022-27670
- **Category:** airworthiness
- **Manufacturer:** GE Aviation Czech s.r.o. (Type Certificate Previously Held by WALTER
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 87 FR 78532
- **Publication date:** 2022-12-22
- **Effective date:** 2023-01-26
- **FAA docket:** Docket No. FAA-2022-1239
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain GE Aviation Czech s.r.o. (GEAC) M601D-11, M601E-11, M601E-11A, M601E-11AS, M601E-11S, M601F, H75-100, H75-200, H80, H80-100, H80-200, H85-100, and H85-200 model turboprop engines. This AD was prompted by reports of cracks in dilution tube weld areas of the combustion chamber outer liner. This AD requires initial and repetitive borescope inspections (BSIs) of the dilution tube weld areas of the combustion chamber outer liner and, depending on the results of the inspections, replacement of the combustion chamber outer liner with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/12/22/2022-27670/airworthiness-directives-ge-aviation-czech-sro-type-certificate-previously-held-by-walter-engines-as)
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