Ceiling Light Unit / Vacuum Conversion

[mit]

To answer the original question about Vacuum pump installation.

There is an STC for a belt driven Vacuum pump Aiborne did it years ago for both the 170 and the 172. Up until the Governor of Missouri got killed you could get it and all the parts for it. I ordered stuff from Aviall 15 years ago for it.

The STC # is SA15CE, SA3-664, SE3-663

Now…… parts are hard to find even the Vacuum pump 212cw-6.

Tom and George have valid points about the venturi system.

But from my experience the vacuum pump was much better than having a venturi. The 212 series pumps have run many, many hours with out failures. I hate having the darn venturi on there, I just don't like them. Seems like, they are always in the way.

That being said; It looks like I may be putting the venturi back on. Both of my pulleys are starting to get worn. I found one for the crank shaft for 2,123.25 Dollars! That is more than the whole STC use to cost.

Here is a link to a thread I started about it.

http://cessna170.org/phpBB2/viewtopic.php?p=32766#32766

Best

[trake]

Hi Kent,
The other option of course is electric gyros. Non STC ones are about a grand a piece. If you are VFR and want a back up there are portable ones http://www.pcflightsystems.com

[kmisegades]

Many thanks for the replies and links to past threads on this ever-popular debate. regards, Kent

[GAHorn]

Be careful when replacing vacuum gyros with electric ones. You must have seperate sources of power for gyros in IFR certified airplanes.
If you have vacuum attitude/directional gyro's ...then you likely have electric T&B. If you substitutde elect. gyros for the vacuum ones,.... you'll need to install a vacuum T&B.