# Proposed AD FAA-2023-1412: Austro Engine GmbH Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2023-20-03
- Products: Austro Engine
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 14, 2023, 88 FR 45118
- Comments due: August 28, 2023
- Became: [AD 2023-20-03](https://openairdocs.org/ad/2023-20-03)
- Docket: FAA-2023-1412 (https://www.regulations.gov/docket/FAA-2023-1412, where comments are filed)
- Project: MCAI-2022-01588-E
- FR document: 2023-14751
- Official PDF: https://openairdocs.org/files/sha256/6b/19/6b19b2137c1fd31c3b7bd571b109c10f5b2512fbd45c301b40196f438e2f797e (from https://www.govinfo.gov/content/pkg/FR-2023-07-14/pdf/2023-14751.pdf)
- Federal Register: https://www.federalregister.gov/documents/2023/07/14/2023-14751/airworthiness-directives-austro-engine-gmbh-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2023-14751-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2023-1412

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Austro Engine GmbH Model E4 and E4P engines. This proposed AD was prompted by reports of piston failures and the determination that certain batches of pistons were manufactured with a dimensional deviation in the piston pin bore and piston diameter. This proposed AD would require repetitive engine oil analysis for aluminum content outside the acceptable limits and, if necessary, replacement of the pistons, piston rings, con-rods assembly, and crankcase or, as an alternative, replacement of the engine core. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jul 14, 2023: Notice of proposed rulemaking (NPRM). (first notice), FR document 2023-14751, comments due Aug 28, 2023 (https://www.federalregister.gov/documents/2023/07/14/2023-14751/airworthiness-directives-austro-engine-gmbh-engines)

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