Dear all,

I fly a brand new machine equipped with a 912 ULS. The engine has currently 70 hours on the clock.

During my last two flights I felt a very short (1 sec) but intense vibration and this at 3 times during each flight. At the time of the vibration I was flying in cruise at 4400 rpm and I do not have the opportunity to see if there was a drop during the vibration.

The similarity between the two flights was the weather conditions (2 degrees, dew point 4 degrees), 50 liters in the tank and the first vibration after more or less 1 hour of flight.

We thought first about carb icing or something wrong in the fuel system. We plan to inspect the tanks of both carburetors.

Has anyone had this type of problem before?


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