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-   -   Edge distance issue (https://vansairforce.net/community/showthread.php?t=120902)

High_Flyer 01-09-2015 12:32 AM

I have received my new parts only 3 days after ordering. Bravo Vans...
My fix is as follows: I drilled out the left side of the roll bar assembly (left aft and fwd channels), match drilled the new aft left roll bar channel through the F-631B inner and outer strips, including the holes at the bottom of the channel making sure that I have proper edge distance. It's all good and I'm now about to re-rivet the roll bar assembly.


Quote:

Originally Posted by Moondog (Post 948556)
Scott A., not sure if I properly responded to your PM.

I was holding my email to Vans until High Flyer got a response, but somehow missed this thread when Van's response was posted.

While it doesn't look good for me, yes, Scott, I will send in to Vans anyway. What a pain, not just to re-build the roll bar, but likely to re-fabricate the match-drilled angles which support it.

Moondog I didn't have to re-fabricate the the supporting angles. I only replaced the left aft roll bar channel and re-used all other parts. I worked for me.
In my case when I drilled the bottom holes in the channel I didn't notice that the roll bar assembly channels got a bit too wide, resulting in the faulty holes. But luckily the two F-631B strips had good edge distance so for me it was just a matter match-drilling the new channel through the F-631B strips and I now have proper edge distance everywhere.

I'm still hesitating to drill out the right side aft channel to be able to re-rivet the two F-631E plates with AN-426 rivets, or leave the right side as it is and use pull rivets to rivet the left side of the F-631E plates to the left fwd and aft channels.
I'll send a quick email to Vans to ask for opinion, I'll post the reply here when I get it.

Alain.

High_Flyer 01-09-2015 09:16 AM

Here is the reply I just received from Vans, and my initial email:

"In this area I would recommend using cherry CR-3213-4-? rivets or MSP-42.

Sterling

On 9 Jan 2015 at 9:08, Alain VAN SEVEREN wrote:

> Sterling,
>
> One last question:
> Please refer to Dwg 39 (picture attached).
> Instead of drilling out the aft right roll bar channel to be able to
> re-rivet the F-631E plates and F-732 angle using AN-470 rivets, is it
> OK to leave the right side roll bar as it is and use eight pull rivets
> to rivet the left side of the aft F-631E plate and F-732 angle to the
> aft left roll bar channel?
> If yes what kind of pull rivets would you recommend? I'm thinking LP4-3? "

So I'll be using MSP-42 instead of AN-426 rivets for the F-631E back plate so there is no need to drill out another 40 or so rivets.

Alain.

Moondog 01-11-2015 06:47 AM

rebuild
 
Van's reply is below. Their response to my mistake was what I expected, certainly can't disagree. Will rebuild this part as posted by High Flyer, thanks Alain.
From Sterling:
The advice from the engineering team on Alain's parts was to rebuild this to have better edge distance. Your picture on VAF would get the same recommendation. In normal operations this would not cause any problem the way it is. The fact that this is the roll over structure of the aircraft and if ever needed it would be best to have it at full strength.


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