Safety recommendation No. 2010/16T
Findings made in connection with this investigation indicate that flying with an engine oil pressure in the region of 2.1 bar can cause serious damage to TAE 125-01 engines even if the red warning light is not illuminated. The DA40-D aircraft flight manual contains no warnings that flying with such oil pressure (yellow warning light) may damage the engine.
The Accident Investigation Board therefore recommends that Thielert Aircraft Engines GmbH reassess the limit values in the operating instructions with regard to minimum oil pressure.