AD 2021-22-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Austro | Engine GmbH | Airworthiness Directives; Austro Engine GmbH Engines |
Unsafe Condition
Failure of the high-pressure pump (HPP) driving gear due to a worn out assembly tool and a stack up of tolerances between the cylinder head, cylinder head cover, camshaft gear, and HPP gear.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the HPP driving gear for engines with an affected cylinder head, and depending on the results of the inspection, replace the HPP driving gear with a part eligible for installation. For engines with an affected HPP driving gear, replace the HPP driving gear either before further flight or within a certain number of flight hours after the effective date of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight or within a certain number of flight hours after the effective date of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Austro Engine GmbH E4 and E4P model diesel piston engines with an affected cylinder head or HPP driving gear.
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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