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At 10:33 AM 4/15/99 -0400, you wrote:
>At 06:46 PM 4/6/99 -0400, Matt Harrop wrote:
> I plan to install an electric AI as a backup to the vacuum
>>driven instruments.  Having a vacuum gyro and an electric gyro means that a
>>single failure can't take them both out.  
>What's wrong with a motor driven backup vacuum pump? 
Several people have pointed this out to me.  Sounds like an electric
standby vacuum
pump is the way to go.