AD 2025-02-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Austro | Engine GmbH | Airworthiness Directives; Austro Engine GmbH Engines |
Unsafe Condition
Reports of piston failures due to dimensional deviations in the piston pin bore and in the piston diameter, which could cause piston failure, with consequent loss of oil, loss of engine power, and reduced control of the airplane.
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Required Actions
Perform repetitive oil analyses and replace the pistons, piston rings, con-rods assembly, and crankcase, or as an alternative, replace the engine core, in accordance with Austro Engine GmbH Mandatory Service Bulletin No. MSB-E4-039/3, Revision 3, dated November 22, 2023.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Austro Engine GmbH Model E4 and E4P engines, with certain engine serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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