AD 2013-17-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Various Aircraft Equipped With Rotax Aircraft Engines 912 A Series Engine |
| engine | Rotax | Aircraft | Airworthiness Directives; Various Aircraft Equipped With Rotax Aircraft Engines 912 A Series Engine |
Unsafe Condition
Oil leaks in the intake channel in the area of the valve guide on some cylinder heads could increase oil consumption and result in engine stoppage.
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Required Actions
Inspect the affected cylinder head assemblies for non-conformance. Replace the cylinder head assembly if non-conformance is found. Prohibit installation of affected cylinder heads unless inspected as required.
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Compliance Time
Before further flight
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Affected Aircraft
Various aircraft equipped with Rotax Aircraft Engines 912 A Series Engine, specifically cylinder heads with Part Numbers 623682 and 623687.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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