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: BTW, I had also considered the Precise Flight backup vacuum system for 
		
	
		
		
		
		
		
	
		 
		
	
	
	: a while, and it certainly is cheaper (around $700 installed). However, : I was concerned by the fact that it would do nothing for you in the : event of failure of the AI vs. the primary vacuum pump. The DG will still work though. In something like the 172 (or my Cherokee), that's a good chunk of the necessary gyro for IMC. What about a non-TSO'd electric AI? Seems like one should be able to install one of those for backup purposes. -Cory -- ************************************************** *********************** * Cory Papenfuss, Ph.D., PPSEL-IA * * Electrical Engineering * * Virginia Polytechnic Institute and State University * ************************************************** ***********************  | 
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