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Old February 26th 17, 05:27 PM posted to rec.aviation.owning
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Default IFR in a vintage 172 - vacuum system

Check this out! It's a backup vaccum system that used vaccum from the engines intake manifold. Not the bee's knees but better than nothing or a $2K plus electrically driven vacuum pump...

http://www.aircraftspruce.com/catalo...dby_vacsys.php

Sorry if my reply is too dated.

Mike
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