This is what John Redman wrote me

Well guys I had a couple of low rpm shut downs on my Bobcat the other day. What I noticed was the rpm falling to around 27,300 from a full throttle to idle transition and then on occassion when I taxied out for takeoff and hit the brakes the engine would shut down with a low rpm condition.

I talke dwith Gordon Dickens as he had encountered the same problem. I gave him the info and he directed me to the UAT. I had mentioned the UAT because of how dark it was. I had suspected it as well, but didn't want to go the $50 way.

Well I pulled the bag out and it was down right discuting. This UAT was in my last Bobcat and now the new one. The UAT has seen close to 300 flights. Now as we know the UAT sits full all of the time. There will be times where I don't fly for a couple of weeks. My guess is the algae groth occured during those times.

End prognosis is if you don't plan on flying for a while then it might behove us to drain the UAT. This is just a thought. I have ran exclusively JP-8 with mil spec 7808 engine oil. This could be a determining factor as well. Now that I am out of the Air Force game I will be running Jet-A. I will continue to monitor this for a while. Don't have a clue about kero as I haven't used it. I do believe if you fly at least once a week, then you have no worries. Fuel continues to transfer through hte system without a chance for growth on an expanded schedule.

I plan on calling BVM and seeing how much these bags are. My guess is they will be cheaper than a UAT tank and they are a snap to change.

Pics are attached to show the discoloration.

John