AD 2010-23-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Austro Engine GmbH Model E4 Diesel Piston Engines |
Unsafe Condition
Several power loss events have been reported, due to rail pressure control failures. Analyses have shown that high pressure (HP) fuel pumps failed as a result of pressure oscillations in the fuel supply line.
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Required Actions
Inspect the fuel pressure supply for excessive oscillations using the schedule in Table 1. Replace the high-pressure fuel pump before further flight if oscillations exceed 300mV (750hPa). Use Austro Engine GmbH Work Instruction No. WI-MSB-E4-009 for inspections.
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Compliance Time
Within 10 flight hours after the effective date of this AD for engines with 45 flight hours or more, or at the next scheduled 50 flight hour inspection for engines with fewer than 45 flight hours.
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Affected Aircraft
Austro Engine GmbH Model E4 Diesel Piston Engines installed on, but not limited to, Diamond Aircraft Industries DA 40 NG and DA 42 NG airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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