I have a simjet 1200 AES with the flightworks pump. It has approx 12 start/run cycles on it. we started experiencing a problem upon startup friday. The turbine will ignite on powermax, heat up, ramp up on fuel, run on kero, but will shutdown once it has obtained idle"yellow light" or just before obtaining idle"yellow and green". It will do this at the same time every time. The immediete history goes like this, 2 test runs no problem, 1 flight no problem, 1 red light shutdown as described, then another flight no problem. Then the next day, 1 shutdown, 1 perfect flight , and then continual shutdowns.

these are the things we tried in order,1. pecked lightly on fuel valve to unstick if this was the case. 2. took out fuel lines and inline filter, checked for stoppage, none found. 3. took out UAT to eliminate it altogether. 4. reprogramed idle setting on TX. Turbine still shuts down at same time or about. The thing that is puzzeling me is that we did get the perfect runs in between problems at first but not anymore. I dont think it is a radio interfence problem,"failsafe set to shutdown engine" because it happens at the same time every cycle. Probably isnt a fuel quality problem because we did get the 2 flights in the middle of this. Bearings are free, rotor isnt rubbing, no air bubbles are dectected entering turbine at time of problems. Engine was new in jan 03, Any help would be greatley appreciated. Thank you. Russell Campbell