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#1
September 11th 07, 04:22 AM
posted to rec.aviation.ifr
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Vacuum pump power source?
Hello,
I was wondering how the primary vacuum is powered in a single engined aircraft. If it was powered directly by the engine, a engine failure would result in the immediate loss of attitude indicator and heading indicator. So I guess most aircraft use an electrical pump that can be driven by the alternator or battery, is this the case? Thanks in advance, Terence 
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