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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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