Jose,
I had a similar problem with my Wren 100 at the beginning of operation three years ago. I started the turbine and took off. During flight it worked fine but I landed it stopped, some times in the final approach before touch down
The problem. A bad pump.
The pump was capable to work at medium to high thrust conditions but at idle the pump doesn't work well and could not keep the idle speed. So, after a few minutes of flight (operation) if I set the throttle stick and idle, the RPM progressively decrease below idle speed and reach the minimum rpm allowed for operation. Then the ECU shut it off.
Pump replaced and no more shut downs in the last 2,5 years....
Mucio
Last edited by mjunior; 09-02-2014 at 08:57 AM.