Russell Croman Posted March 3, 2012 Report Share Posted March 3, 2012 Hi folks, I'm a new owner of an '06 CTSW, and also a new pilot... just did my first solo two days ago. Yesterday I did my second solo and had engine trouble. At about 250' after takeoff the engine started a sort of oscillation between about 4000 and 5000 rpm, maybe a little faster than once a second, dropping off and then surging back to life. I started looking for a field to make an emergency landing in, but also pulled the throttle back a bit and the engine smoothed out, for a few seconds anyway. Going back to full power, it ran okay for a few seconds, then started surging again. Fortunately there was enough power through all of this that I was still climbing. At maybe 800' I made the turn downwind and brought it around in a tight pattern to a safe landing. After changing my shorts, conferring with my instructor, and popping the cowl to look for anything obvious with a (non-Rotax) mechanic nearby (e.g., balance tube came off or something), we did a couple of high-speed taxis at full power and it ran just fine. We took off together and climbed out over the runway. After several minutes, it did it again. Just one surge, but it was enough to rule out trying to fly it back to our home airport. We landed it and tied it down, and it's now waiting to be serviced. The engine did this once before, right after I purchased the plane. A buddy and I flew it down to Sebring and went to the Sport Expo while the ELT got upgraded and a leaky valve cover was fixed. Carb sync and idle adjustment were also performed. When we took off to fly it back to Texas, the engine did the same thing after maybe four minutes of climbing. Again it would steady out a bit, but not completely, if I reduced power a little. We returned to Sebring, had the mechanic look it over, drained some fuel to make sure it was clean, and found nothing. I chalked it up to having forgotten to sump the fuel during the preflight. We took off again and it ran just fine for the next 20 hours, until yesterday. Any ideas on what could cause this? Here's a link to the cockpit video... the surging starts at about 0:40. No audio, but you can see the tach fluctuating. Thanks, Russ N296CT Link to comment Share on other sites More sharing options...
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