Hi there,

I am new to turbines and am in need of some help and advice from some fellow turbine fliers. I have a JJ 1400, and the thing runs superbly. I had it mounted on a test stand before installing it in my stingray, and all the test runs went just fine. I had to tinker around with the acceleration, deceleration and stability delay just a bit, but I eventually had it so that I could "slam" the stick to full power, and the engine wouldn't flame out.

So, I pulled it off the test stand like I said, and installed all of the gear in my stingray. I then tested the engine several more times just to verify that every thing was still working properly. Up to this point, I was using a 5 channel FM radio system, and I had ordered a 7 channel radio system with PCM capabilities.

I swapped out the FM receiver and installed the PCM receiver and got all the channels sorted out and also reprogrammed the FADEC to the new radio. I went out to once again test and check everything to make sure things were still in working order. However this is when despair came knocking on my front door!

I initiated the start sequence, and the engine started just like normal. I let it idle for about a minute and just watched the HDT to make sure things were "cool." I then slowly advanced the throttle all the way to full power and then slowly back again. Everything was fine, so I once again advanced the throttle slowly to full power and then quickly pulled the throttle to idle to make sure the Deceleration delay values were still suitable. Deceleration went without a hitch.

Now, the third time I "slammed" the throttle to full power, and seemingly at about 75% power the engine faltered and began losing rpm and eventually there was a torch like flame suspended in the air just behind the exhaust nozzle and the engine spooled down. Of course I immediately shut down the engine with my controls and turned the fuel shut off valve to the off position.

After contemplating what had just happened, I started the engine again, and after letting it idle for just a little, I slowly advanced the throttle and was able to obtain full power and hold it indefinitely. Also, I could chop the throttle from full power and no problems there either. It is only when I "slam" the throttle to full from idle that the engine will quit.

Anyway, to make a long story of, start after start after start and test after test after test, short I eventually had a value of 150 on the acceleration delay, and still it would falter, lose rpms, and flames will be suspended in the air just behind the tail cone.

It is very frustrating to me when I had it running just fine, and now all of a sudden when I am ready to go test fly it the acceleration is giving me problems.

Anyone have advice or know what cold be wrong?? The only thing that changed what the radio system. I just thought that somebody here might be able to help me with this problem.
If you have any questions that need answering for you to determine what might be wrong, please ask and I will answer. I just want to go flying!

Thanks for your time,
Brandon