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#2
August 17th 05, 08:07 PM
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What kind of airplanes do you have? I can understand wanting attitude
indication redundancy in a Bonanza, but it's overkill on a Skyhawk. Do you have redundant attitude gyros? I've seen more of those fail than dry pumps, never mind wet. There are two basic approaches - tapping the intake manifold (which means full throttle is no longer available if you want vacuum), and an electrically driven backup pump (which adds weight). Decide whether you want to carry the extra weight around all the time, or whether you want to limit yourself to partial power when the vacuum fails. Both systems work. I think that if you really feel the need for redundancy, the sensible solution is replacing the T&B with an electric AI. Michael 
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