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Artificial Horizon adjustment

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harleygaz

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Hi. I know this should go in the technical forum but there isn't really a heading for it so I thought I'd ask the smart guys here... My Artificial Horizon / Attitude Indicator is off with the horizon showing high on the left, low on the right when the plane is flying level. The instrument responds OK to changes in attitude and bank so it seems to be working, it's just not properly zeroed. Is there a way to adjust it? If so can somebody tell me how? It's vacuum driven by a Venturi vacuum tube mounted below the fuselage between the undercarriage legs. Cheers Gary N503CM Starduster Too
 

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