Rotax 912 ULS failure after takeoff

Hello Paul,

How can the carb bowls run low with an operating aux fuel pump?

Jim

Thanks for the replies everyone.   To answer some of the questions, yes the plane has a fuel return system and it was all functioning normally.  There has been no recent work done on the coolant system and the CHTs are always slightly high on the plane compared to other aircraft (~110C) but never out of range.   I am running waterless coolant which brings that up a bit.  I pulled apart the carbs and cleaned them, but didn't find anything blocking the jets.  Thanks!

A couple of checks that I would perform are 

- in turn remove a float bowl cover on each carb, run the aux pump and measure how much fuel you get out in 5 mins. (do you have sufficient fuel flow for sustained max rpm climb out)

- clean the pistons on each carb and ensure the up and down movement (finger in the carb throat) does not have any friction.

- what's the venting system on your fuel tank ? could that be blocked ?

- you could have bad fuel, empty the tank and refuel.

The variation in power at your full power test is not normal