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Avionics Mounting

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gmvouga(at)hotmail.com
Guest

Posted: Thu Mar 29, 2007 5:53 pm Post subject: Avionics Mounting

Hi All,



I am hoping to get some info on mounting a stack of Garmin equipment in my 

RV-7A.  I just received a GMA-340, GNS-430W, SL-30, and GTX-327 with 

mounting trays.  I'm told that the rest of the mounting hardware such as 

screws, brackets, etc. are not included.



I can start looking for low profile screws and fabricate brackets, but I 

don't want to re-invent the wheel if it's not necessary.  Are there 

reasonably priced installation kits out there?  How have others handled 

this?



Thanks in advance,



Greg

gvouga(at)gmail.com



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lamar(at)takeflighttexas.
Guest

Posted: Thu Mar 29, 2007 7:13 pm Post subject: Avionics Mounting

Greg,

  I have a simalar setup. Pma8000, 430, and 327. sl30 or 40 to come later. 

I have the affordable panels xl panel.  what i did was make the panel with 

063 angles to hold the instrument trays as per the directions.  i then 

mocked the instruments up and set them up were i wanted them.  I then 

removed the instruments from the trays and drew a line for reference to keep 

the instruments lined up.  i then started at the top of the panel and worked 

my way down.  I put the intercom tray in and lined the holes up with my line 

and drilled the holes to the size to tap a #6 screw.  Did i mention i went 

to the hardware store and purchased a drill and tap kit for #6 screws (comes 

with a bit and tap), well now i did. I used 3/32 clecos to hold the tray in 

place as i moved from one hole to the next. I made sure it was level by 

leveling the fus and then checked the panel trays, i also used a builders 

square to make sure everything looked correct. so i drilled the holes and 

then put screws in to hold the try.  I used flat head #6s. the smalllest i 

could find were 1/2 but funny thing is im a computer nerd and the screws 

that hold hard drives in computers are #6 1/4 these worked a lot better.  so 

i held the instrument in place with the screws and then mocked up the next 

instrument.  I did this to make sure the faces lined up.  Everything was on 

the line i drew except the 430 it had to be set back just a tad to make all 

the faces line up with the other instruments. I just worked my way down till 

i had holes drilled and tapped all the way down both angles.  I have seen 

this done in two other airplanes, RV9As but the 9 and 7 are the same panel. 

Im sure there are a dozen other ways to mount your radios, i liked this way 

because im a kiss kind of guy.  Good luck and if you need pictures, let me 

know.

Thanks,

Lamar - N969LS - RV7A



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charlieray(at)optonline.n
Guest

Posted: Fri Mar 30, 2007 3:04 am Post subject: Avionics Mounting

Standard #6 countersunk machine screws hold the cases to the rails. Rails 

can be made out of whatever you choose.  aluminum extruded angle stock works 

well and you can tap it or use thin angle and mount clip nuts so you can be 

less precise in your drilling.  Cut a thin .020 support to run from the top 

hole (the upper screw holes of whatever your top radio is) down to the rear 

support of the lowest radio to hold everything up.



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vete76(at)twcny.rr.com
Guest

Posted: Fri Mar 30, 2007 3:28 am Post subject: Avionics Mounting

wwhere did u buy 340?. 

                                                                   

Click to enlarge the image               

Garmin's GMA 340 audio panel meets the needs of        aircraft owners and operators who require reliability and versatility in        the essential audio switching function.        

                                                         

 Package Includes:                                              GMA 340 audio  panel         
Installation          kit**********************************************************sya here, comes with screws etc(doesn't it?)                   
Installation  manual         
Pilot's guide       



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Jekyll

Joined: 22 Feb 2006
Posts: 44

Posted: Fri Mar 30, 2007 10:05 am Post subject: Re: Avionics Mounting

Greg:



Here's how Fabian suggested I install my stack. It worked like a champ and was simple.



1. Install all of the backplates to the cases, and then fully install radios in the cases and snug them in. 



2. Line up the front of the faces vertically, I used a carpenter square to ensure they were alligned. 



3. Carefully wrap the stack with duct tape to hold the cases together with the faces aligned. An extra set of hands helps considerably.



4. Remove the radios and the backplates leaving the taped up stack as an assembly. I guess the backplates can stay on unless they are prewired, you don't wan't the harnesses pulling and getting in the way when installing.



5. Now you can put the stacked racks into the panel using .063 or larger angle along the sides. Flush rivet the angles to the panel. Drill the angles through the cases for #6 countersunk screws. This is the only difficult part. I ended up marking the holes from the inside and removing the stack to drill the angle. 



The radio instructions state to have the ends of the cases flush with the front of the panel. This is not necessary. The cases might not all fit the same so your goal is to have them all extend the same distance. The tape method allows you to easily do this. Next, adjust the depth of the stack to make sure the screw holes in the boxes will fall correctly in the mounting angles to provide proper edge distance. Again, this is also more important than having the cases flush with the front of the panel. In my case, I used the Affordable panel which is .090 thick with a subframe that is also .090 thick. That's a whopping .180 in thickness. If I had tried mounting the cases flush, the screw holes would have aligned with the perpendicular portion of the angle.



6. Dimple the holes in the cases as necessary if you can, countersink the angles. Screw through the cases and angles and lock them with the method of your choice, anchor nuts, nuts or tapping. I chose regular lock nuts because I have the 3-piece modular panel which will provide sufficient future access.



7. Strap the racks together near the middle or back to support the boxes. If your holes are good and your screws are tight, the cases will tighten up in a rigid box structure.



8. Install the backplates and insert the radios. You faces should line up nicely.

Vete76:



The radios do come with the installation hardware as indicated. It's defined differently than you may think. Installation means installing the the backplates to the cases, including the connectors and pins. Mounting hardware is peculiar to each installation and is provided by us.



Jekyll

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