AD 2023-20-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Austro | Engine GmbH | Airworthiness Directives; Austro Engine GmbH Engines |
Unsafe Condition
Piston failures due to dimensional deviations in the piston pin bore and piston diameter, which could lead to loss of oil, loss of engine power, and reduced control of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct initial and repetitive engine oil analysis for aluminum content outside acceptable limits. If necessary, replace the pistons, piston rings, con-rods assembly, and crankcase, or as an alternative, replace the engine core.
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Compliance Time
Within the applicable compliance times specified in the AD, which are not detailed in the provided text.
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Affected Aircraft
Austro Engine GmbH Model E4 and E4P engines with serial numbers listed in Tables 1, 2, 3, and 4 of Austro Engine GmbH Mandatory Service Bulletin No. MSB-E4-039/1, Revision 1, dated April 24, 2023.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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