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Difference Bet Electr AH N Air Driven Instruments

Tue Jan 15, 2013 8:55 pm

"With an electrically driven artificial horizon, acceleration and turn errors are minimized or completely eliminated because the instrument has little or no pendulosity and its normal erection system can be cut out at certain value of longitudinal or lateral (balanced turn) acceleration."

Could someone explain exactly how having more pendulosity will a bigger degree of error?
What does it mean by its normal erection system can be cut out at certain values of longitudinal or lateral acceleration?

Thanks

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