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  #1  
Old 08-10-2013, 05:28 PM
LAMPSguy's Avatar
LAMPSguy LAMPSguy is offline
 
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Default snap bushing callout

I have searched - nothing found, new post

I am using the current revision 1

12-04 Step 3 "enlarge lower fwd systems hole as shown in figure 1"

Figure 1 calls for 7/16" - SB437-4 or 1/2" - SB500-6 yet the callouts in figure 2 show SB375-4 (requires 3/8" hole).

Since the revision changed the callouts on this very page, what goes there? Is the callout correct(SB375-4) or is the Figure 1 correct and should I be placing SB437-4 here?

**edit** I added up the total required bushings based on what the plans call for and none of the numbers match up with the quantity shipped/nor the quantity listed in the inventory. I was hoping to use that as a guide for which bushings went where. I am not worried about the hardware, I just want to drill the correct holes!
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Last edited by LAMPSguy : 08-10-2013 at 05:45 PM. Reason: incorrect units
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  #2  
Old 08-10-2013, 07:14 PM
Mike K Mike K is offline
 
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We ran into this same issue. I contacted Vans and they sent me 22 SB550-6 bushings at no charge.

Mike
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  #3  
Old 08-10-2013, 07:28 PM
Mike K Mike K is offline
 
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Sorry, sent that premature. We installed bushings based on page 12-04 figure 2 revision 1 for the left wing and 12-05 figure 1 revision 1 for the right. I threw out the original pages so don't know what they showed. We needed more of the SB500-6 bushings then they sent to finish the right wing. When I e-mailed Vans they sent me the additional snap bushings I needed.

I really have very little idea of what I am doing so keep that in mind!

Mike
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  #4  
Old 09-26-2013, 02:48 PM
Tom023 Tom023 is offline
 
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Default Answer?

I ran into the same question today and placed a call to Vans. Recommendation is use SB375-4 (3/8) for all forward-lower holes as shown in the call outs, not as shown in Figure 1 for the left wing, and SB500-6 1/2" on the right as indicated, just as Mike did.
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Last edited by Tom023 : 09-26-2013 at 03:39 PM.
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  #5  
Old 09-26-2013, 07:49 PM
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Debovsky Debovsky is offline
 
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In my case, I decided to change and adapt the SB call outs based on what you can see on Section 17.0 instead of those indicated in Section 12.0. Reason for that is quite simple; why should I install a snap bushing that is larger than necessary? I have selected the SB size after threading the wire harnesses through the SB's (just to try it out) as the cable run had to go through the ribs as per figures found in Section 17.0. Did that for both wings. Besides, I didn't like the idea of a pneumatic line rattling in a hole being to large.

Also, if you decide to install say, a Dynon heated Pitot/AOA + backup PFD instrument (that is my choice) in your panel, you will run out of system holes. Taking the left wing as an example, you need one hole (.500in) for the 2 wire harnesses, one hole (.375in) for the Pitot line "out", from the ADAHRS unit to you panel, one hole (.375in) for the AOA line "out" from the ADAHRS again to your panel and finally, one hole (.375in) for the "Static" line TO the ADAHRS. That makes a total of 4 SB on the first 8 wing ribs. i called Van's few days ago to confirm the 4th hole and Sterling said it'll be fine.

Right wing is much simpler. I started with .500in SB then followed by .437in and a few last with .375in
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  #6  
Old 09-27-2013, 05:57 AM
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propsync propsync is offline
 
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Quote:
Originally Posted by Debovsky View Post
In my case, I decided to change and adapt the SB call outs based on what you can see on Section 17.0 instead of those indicated in Section 12.0. Reason for that is quite simple; why should I install a snap bushing that is larger than necessary? I have selected the SB size after threading the wire harnesses through the SB's (just to try it out) as the cable run had to go through the ribs as per figures found in Section 17.0. Did that for both wings. Besides, I didn't like the idea of a pneumatic line rattling in a hole being to large.

Also, if you decide to install say, a Dynon heated Pitot/AOA + backup PFD instrument (that is my choice) in your panel, you will run out of system holes. Taking the left wing as an example, you need one hole (.500in) for the 2 wire harnesses, one hole (.375in) for the Pitot line "out", from the ADAHRS unit to you panel, one hole (.375in) for the AOA line "out" from the ADAHRS again to your panel and finally, one hole (.375in) for the "Static" line TO the ADAHRS. That makes a total of 4 SB on the first 8 wing ribs. i called Van's few days ago to confirm the 4th hole and Sterling said it'll be fine.

Right wing is much simpler. I started with .500in SB then followed by .437in and a few last with .375in
that's good to know, I figured there would be an issue like that down the road. For now though, I just went with the diagram, will tackle all that later. Thanks for posting.
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  #7  
Old 09-27-2013, 08:14 AM
Tom023 Tom023 is offline
 
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Yes Marc, thanks for posting. You have convinced me to take a little better look into my avionics requirements now rather than later. Somehow, however, I see a right angle drill in my future.
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  #8  
Old 09-27-2013, 10:28 AM
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LAMPSguy LAMPSguy is offline
 
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Default Go with the flow

OK, I will just stick with the callouts. I figure extra room is fine, not enough can be fixed later too!.
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  #9  
Old 09-27-2013, 10:37 AM
Tom023 Tom023 is offline
 
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Curious as to the avionics installation requirements and components in the left wing, I just briefly flipped through the Skyview and G3X installation guides. While the basic components are the same, where and how they are mounted do vary. Garmin does not recommend the ADAHRS be wing mounted due to flex and lack of airflow. Dynon shows the wing bays closest to the fuselage as acceptable. Obviously your choice of system will impact how many and where system holes are required. I won't decide on avionics until the latest possible point so the way I choose to drill the holes now won't be perfect, that I am sure of.
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