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#1
October 6th 06, 04:41 PM
posted to rec.aviation.ifr
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Attitude Indicator
Every time I get in the aircraft and before I start the engine I notice the attitude indicator is displaying a nose down and a left turn. You just described the expected behavior. Why is this surprising to you? Are you expecting the AI to jump to level when you turn the master on? -harry 
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#2
October 8th 06, 09:55 PM
posted to rec.aviation.ifr
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Attitude Indicator
It is weighted slightly off center to make up for the coriolis
acceleration due the rotation of the earth. The weight makes it precess as required to appear to be level. And the erection mechanism is as others have pointed out... takes the average downward vector and calls that level. Bill Hale wrote: Every time I get in the aircraft and before I start the engine I notice the attitude indicator is displaying a nose down and a left turn. You just described the expected behavior. Why is this surprising to you? Are you expecting the AI to jump to level when you turn the master on? -harry
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