REFLECTOR: Avionics bus switch

[Brooke Wolf]

Don

I think you are going to find people all over the map on this.  I can tell you what my own experience is.

My panel does have a master avionics switch.  It switches all the avionics except for my 2 GRT screens.  They come on with the battery.  The #1 screen is also backed up by a power stabilizer.  The normal start sequence for me is to turn the battery switch on, wait for GRT to power up, select engine display, and start the engine.  #1 screen always stays on line during start due to power stabilizer.  #2 screen almost always goes off line due to voltage sag during start, and I have to reset the CB to get it powered up again.  (I tried the "soft startup" but it seldom works).

Currently, the only thing I wish I had done differently would be to put the #2 screen on the master avionics switch.  That way I could avoid the hassle of resetting it after start.  Otherwise, everything works good.

Brooke


On Mar 19, 2013, at 1:31 AM, reflector-request at tvbf.org wrote:

> From: Don Johnston <numa at comcast.net>
> Subject: REFLECTOR: Avionics bus switch
> Date: March 18, 2013 8:37:57 PM EDT
> To: reflector at tvbf.org
> Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> 
> 
> Because of institutional memory, OWT, etc. I'm trying to decide how to handle the avionics bus. 
> 
> Since the first day I sat in an airplane, I've always been told to never turn on the avionics until the engine is running lest to fry all the expensive, delicate, precious electronic devices.  Then again, I was also told to never run LOP, land without flaps, or taxi faster than an 80-year-old man can walk. :-)
> 
> Since I'm going to have all the engine info on GRT displays, there is no way to see the actual engine information unless the avionics are on before engine start.
> 
> So how are you guys getting engine info in a pure electronic panel environment? Separate, clean, protected bus for avionics? Ignore it since it's an OWT?  So other solution?
> 
> -Don

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