standby vacuum systems

GeorgeC

GeorgeC

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GeorgeC
I have flown a few planes with standby vacuum systems.

Why isn't the primary done this way? If you need vacuum for your gyros, why not do it with no moving parts, instead of a mechanical pump?
 
Um aren't the standbys exactly the same? Just standing by?


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I thought they worked because manifold pressure < ambient pressure.
 
There are some that do yes now that you mention it. It's only reliable at lower manifold pressures like on approach. My standby is an electric that is basically just another pump


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Also that type of backup is only good to about 8k feet


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And when he says low manifold pressure, it's low. In a Saratoga for example, you'll be back to around 14 inches or so, in order for it to be operational.
 
If you are using a engine induction standby vac pump, they do not work at full throttle. The concept is to provide vacuum at low power settings to allow for properly operating instruments during an approach.
 
Random aside: for the longest time I thought 'gsengle' and 'GeorgeC' were the same poster.
 
HouTxPilot82 said:
Random aside: for the longest time I thought 'gsengle' and 'GeorgeC' were the same poster.
Click to expand...

Kinda cool the way I/we talked to my/ourself there lol


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