# Proposed AD FAA-2010-0522: Various Aircraft Equipped With Rotax Aircraft Engines 912 A Series Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-23-17
- Products: Various
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 21, 2010, 75 FR 28504
- Comments due: July 6, 2010
- Became: [AD 2010-23-17](https://openairdocs.org/ad/2010-23-17)
- Docket: FAA-2010-0522 (https://www.regulations.gov/docket/FAA-2010-0522, where comments are filed)
- Project: 2010-CE-022-AD
- FR document: 2010-12298
- Official PDF: https://openairdocs.org/files/sha256/c3/ab/c3ab1ffed9f36714e9e0c54ae7b2823406fdd468846e213bd02ca8cfe1be9e22 (from https://www.govinfo.gov/content/pkg/FR-2010-05-21/pdf/2010-12298.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/05/21/2010-12298/airworthiness-directives-various-aircraft-equipped-with-rotax-aircraft-engines-912-a-series-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/461A6B2884E9981A8625772A0060B912.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0522

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: This Airworthiness Directive (AD) results from reports of cracks in the engine crankcase. Austro Control GmbH (ACG) addressed the problem by issuing AD No 107R3 which was superseded by ACG AD A-2004- 01. The present AD supersedes the ACG AD A-2004-01. On one hand, introduction by Rotax of an optimized crankcase assembly has permitted to reduce applicability of the new AD, when based on engines' serial numbers (s/n). On the other hand, applicability is extended for some engines that may have been fitted with certain crankcase s/n, supplied as spare parts. In addition, accomplishment instructions given through the relevant Service Bulletins (SB) have been detailed to better locate engine's areas that are to be scrutinised. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- May 21, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-12298, comments due Jul 6, 2010 (https://www.federalregister.gov/documents/2010/05/21/2010-12298/airworthiness-directives-various-aircraft-equipped-with-rotax-aircraft-engines-912-a-series-engines)

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