chopperboy

Hey Tommy - Thanks for the input. Tried switching off electric trim, but still have same problem. Here's the weird part that I'm not sure everyone has understood. With both gear and stall warning breakers pulled, horn is off. With either pushed in the horn sounds. However, contrary to what some have written here, it sounds like the exact same horn. A couple of the guys have suggested that there are two separate horns, one for each. However, if I have both breakers pushed in with the horn sounding, and I pull one or the other, there is absolutely no change in the sound of the horn. No pitch change, no volume change, notta... zilch. So there is either a single horn common to both, or the issue is pushing either breaker sounds one of the two separate horns. As they say... go figure! Thanks again.... Anybody else want to chime in?

Okay... had already tried flipping the stall vane and no change. Plus... this happens with the gear warning as well... stall and gear warnings share the same horn, correct? Thanks again guys.

I wrote here not long ago about a turbo problem that I just got fixed from the wonderful, friendly folks at Main Turbo. But, now I have a new problem. I picked up the airplane for the flight home. Liftoff, gear up, turning on course and a warning horn alerts. Nothing out of the ordinary showing, annunciator lights dark, can't figure it out. Proceed 10 minutes to home base with horn blaring. Pre-landing check is fine, including gear down and locked. Then on short final horn gradually gets weaker and then goes off completely. Check out everything on the ground, taxi back and take off again to see if it comes back on. Same exact scenario from start to finish. Taxi to the ramp with no horn, cool off and shut down. Next day trying to troubleshoot, turn on master and horn comes on. No radios on, just master. Start pulling breakers and find a combination of pulling the gear warning and stall warning breakers silences the horn. Push in one or the other and the horn sounds. With both pulled it's off. I'm figuring both warnings use the same horn because it sounded the same regardless of which of the two breakers I pushed in. Ever heard of this before? Any ideas? Appreciate any help I can get. Thanks!

To All - Thanks again for all the advice. And you bet Mike... I don't screw around with power issues at all... or anything else for that matter. I figure that's why I'm not dead yet. After all the comments here we're declaring "uncle" on this one and pulling it off the airplane... contacting main turbo today to send it out to them for a good look. I will keep you all posted on the final results. Have a Happy New Year everyone!

One thing I failed to mention is that it will sometimes provide partial boost... not all the way to 35", but maybe to 31 or 32, and sometimes not at all. That's why so far we've been focusing on a wastegate problem. On one test flight I took the runway, slowly throttling up to full power... very sluggish with obviously no boost. Just before full throttle the turbo kicked in with very obvious full boost. Also, don't know if this may be related, but the MP gauge is very sluggish as well, and can take 15-20 seconds to finally settle in on any given throttle setting. Any more ideas? Thanks again!

Thanks guys for the speedy responses. I will check all the above-mentioned items. Don't recall any oil pressure fluctuations. I'm sure the mechanic knows there are two controllers but I will check just to be sure. Let me know if any others have any suggestions and I will keep you posted on what we find. Thanks again!

Hi Folks - I am a relatively new owner of a 2007 Mooney TLS with about 300 hours on the second engine. The turbocharger works sometimes, doesn't work other times. Seems to be no rhyme or reason. Mechanic has had the entire system apart...including wastegate, etc. with no definitive anomalies. Exhaust and all other plumbing in good shape. Controller was sent in for inspection and tested fine. Turbo will usually work on first test flight, but not subsequent flights if within a few hours. Thought it was a heat related problem, but sometimes it will work fine on the second flight and other times not. Mechanic is very good... but is baffled on this one. I have over 15K hours SEL and I am clueless as well. Anyone with similar experiences? Thanks so much. New to the site and finding it very informative.