procharger Posted March 30, 2015 Report Share Posted March 30, 2015 My CTSW developed a whine noise for a few min. while flying today it then quit and did not come back any thoughts on what it might be? No indications on any gauges that anything was wrong. Link to comment Share on other sites More sharing options...
Anticept Posted March 30, 2015 Report Share Posted March 30, 2015 We are in a constant battle with this problem on our planes due to high utilization. The whine is either a loose connection to the capacitor, or it's failing itself. Second cause that we've had was a voltage regulator going bad, and you can see the voltage acting a little unusual (lower than normal) if it starts whining. These usually fix the problem, and over time as the parts begin to fail, we have to fix them again... If you are experimental, chanik has recommended a beefy screw terminal capacitor that works very very well. Link to comment Share on other sites More sharing options...
Roger Lee Posted March 30, 2015 Report Share Posted March 30, 2015 Was the whine electrical in nature and in the headset or an outside the headset whine? If it was outside the headset it is most likely a wind leak up around the wing root. If it is in the headset then check the connections on the back of the radio tray. Link to comment Share on other sites More sharing options...
chanik Posted March 30, 2015 Report Share Posted March 30, 2015 A good test is whether the whine shifts frequency with engine RPM. Losing the cap will do it for sure. Incidentally, that Kemet cap is fine for SLSA as well. It meets ROtax specs and they do not call out anything specific. Link to comment Share on other sites More sharing options...
procharger Posted March 30, 2015 Author Report Share Posted March 30, 2015 Roger noise was outside headset.I noticed on a couple flights a while back alt light came on and soon went back off never done that before since I had the plane, going on two years now. Link to comment Share on other sites More sharing options...
Roger Lee Posted March 31, 2015 Report Share Posted March 31, 2015 If it's outside the headset then I would look for an air leak first. Make sure the wing root gap is taped from all the way over the top and all the way back on the bottom. Make sure the tape is not cracked. If that's good then check the front edge of the cabin doors. Whether this is where the noise is coming from or not I don't know, but I bet you do have a leak there. The common noise problem is usually the wing root gap. Link to comment Share on other sites More sharing options...
procharger Posted March 31, 2015 Author Report Share Posted March 31, 2015 My brother was flying said it was in headphones start checking some wires I guess thanks. Link to comment Share on other sites More sharing options...
Roger Lee Posted March 31, 2015 Report Share Posted March 31, 2015 If it's in the headset then check to make sure a lead is not broken off the capacitor. The second place I hear from people with headset noise is a bad wire on the back of the radio tray. Also tighten all ground wires in the engine compartment and behind the panel on the passenger side. These couple of items should be a reasonable place to start. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted March 31, 2015 Report Share Posted March 31, 2015 If it's outside the headset then I would look for an air leak first. Make sure the wing root gap is taped from all the way over the top and all the way back on the bottom. Make sure the tape is not cracked. If that's good then check the front edge of the cabin doors. Whether this is where the noise is coming from or not I don't know, but I bet you do have a leak there. The common noise problem is usually the wing root gap. I had a loose piece of gap seal tape on the wing root last year. When I hit 110 knots it sounded like the world was ending, scared the hell out of me. But the alternator light coming on when this happens is troubling. Link to comment Share on other sites More sharing options...
WmInce Posted March 31, 2015 Report Share Posted March 31, 2015 . . . "But the alternator light coming on when this happens is troubling." . . . Link to comment Share on other sites More sharing options...
Ed Cesnalis Posted March 31, 2015 Report Share Posted March 31, 2015 I now have my wing root gap leak perfected and its working just like a stall horn. Link to comment Share on other sites More sharing options...
Roger Lee Posted March 31, 2015 Report Share Posted March 31, 2015 If you have too many electronics turned on and go to idle in the pattern you may easily get down to a low voltage light. Link to comment Share on other sites More sharing options...
procharger Posted March 31, 2015 Author Report Share Posted March 31, 2015 Brother said noise did not change with different RPM s thanks he said noise stopped when he touched down on landing which sounds like loose connection ???? somewhere Link to comment Share on other sites More sharing options...
Tom Baker Posted April 1, 2015 Report Share Posted April 1, 2015 Look at the tape. Link to comment Share on other sites More sharing options...
procharger Posted April 2, 2015 Author Report Share Posted April 2, 2015 Tom, Sorry what do u mean look at tape? Link to comment Share on other sites More sharing options...
Roger Lee Posted April 2, 2015 Report Share Posted April 2, 2015 The tape around the wing root. It should not be cracked anywhere (look carefully) and it should go from the far rear of the wing on top and all the way around the front and under the bottom to the rear of the wing. Link to comment Share on other sites More sharing options...
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