standby vacuum systems

GeorgeC

GeorgeC

Administrator
Management Council Member
Joined
Dec 5, 2010
Messages
6,581
Display Name
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?


Sent from my iPhone using Tapatalk
 
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


Sent from my iPhone using Tapatalk
 
Also that type of backup is only good to about 8k feet


Sent from my iPhone using Tapatalk
 
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.
 
You must log in or register to reply here.
Back
Top