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Artificial horizon and VSI not working.

  • 10109
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23 Jan 2016 19:46 #1 by 10109
Replied by 10109 on topic Artificial horizon and VSI not working.
Thanks to 9994. I think you hit the problem. I'll check it out. Regards, Larry

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23 Jan 2016 13:57 #2 by Ronald Raty
Replied by Ronald Raty on topic Artificial horizon and VSI not working.
I don't think the two systems share any components. The VSI runs off the pitot pressure, the AH runs off a vacuum. However, if the hoses for the two got inadvertently switched, there would now be pressure where there should be vaccum and vice versa. It might make those gauges reversed.
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21 Jan 2016 14:29 #3 by Larry Snyder
Replied by Larry Snyder on topic Artificial horizon and VSI not working.
I'm not much help here, but I would have someone who knows check the air tubing out in your plane. VSI could just be a line connected to the wrong place, and artificial horizons are gyro instruments and it could be just plain not working. I assume you have a venturi driving the artificial horizon, perhaps there's a kink in the air line between them...

Larry
N99340

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  • Brandon Brooks
13 Jan 2016 15:08 #4 by Brandon Brooks
Replied by Brandon Brooks on topic Artificial horizon and VSI not working.
You're not by any chance flying inverted are you? That might explain it. :-)

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  • 10109
  • Topic Author
23 Oct 2015 00:07 #5 by 10109
Artificial horizon and VSI not working. was created by 10109
My Ercoupe 415C is wonderful except for one problem and I don't know what to look for. When flying my artificial horizon will turn upside down and my VSI (vertical speed indicator) reads backwards. When I go up it reads going down and so on. Because they are happening together I'm wondering if they have a common cause. I'm not sure what to look for. Even if I can't fix it myself, I like to know the cause so some mechanic can't nail me to the wall. Thanks for any help you can give me. The plane does have a venturi on the left side. Regards, Larry N93436

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