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Snap bushings in wing ribs of RV-14
I am wondering as to the latest opinion concerning the snap bushings in the wing ribs (Ref 14-04) I am aware of the "Master list of common errors" posting by Debovsky questioning the size of the bushings (thanks!). But I don't know what the final verdict is. I am at the point of drilling the rib holes and I don't want to try to shrink the holes if they are drilled out too much. Also, if I change the whole size, I will need to source out a larger snap bushing.
My crystal ball cracked last week so has anyone gotten a revelation or maybe figured it out for sure? |
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Was your wing kit shipped prior to 9/25/13?
If not, then your plans should have all of the updates done at that time (some of which included changes/corrections related to snap bushings. You can compare your plans the latest up date issued on that date by going HERE |
My previous plans were pre updates, but I have since downloaded the latest. I guess I was concerned that the latest instructions reflected the issue of correct bushing sizes. Obviously trying to fix the bushing issue down the road would be difficult at best. The "Master list of common errors" did not mention if the bushing trist was addressed with the new updates.
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Snap bushings
My kit (#39) was pre-update. I changed to the post-update snap bushings before installing the the bottom skins. I purchased the snap bushings from Vans for a few dollars. I also purchased an assortment box of snap bushings from Stein Air. I figure I will need it at some point.
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I understand changing out snap bushings after the wings are complete would be impossible. Van's has supplied all the wing harness with the wings and they easily fit into the first version print snap bushings. What are the revisions for?
The only way I see you can add wires to the wings after the fact is if you had conduit to slide the wires thru. |
If you are concerned with the hole size, you can always drill a few different holes in some scrap material and see which size you like best.
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Revised pages still wrong
I was at this step today and am convinced pages 14-04 and 14-05 still have errors. For example, on 14-04 the snap bushing sizes indicated in Figure 1 don't always match the call outs in the ribs themselves. Both pages 14-04 (left wing) and 14-05 (right wing) say to enlarge the Upper-Aft systems hole. Not one of my ribs has a pilot hole for the Upper-Aft systems hole; I can make one but wondering if anybody else's ribs had it. On page 14-05 (right wing) step 3 says to enlarge the Upper-aft systems hole, but looking ahead at the systems routing drawing for the right wing page 19-01, an Upper-Aft systems hole wouldn't be used, unless I am missing something.
I would recommend studying section 19, page 19-01 may be enough, and drill the holes accordingly. Maybe test fit the harnesses in the bushings to determine the best size. |
Fitting the snap bushings in place and holding nicely is not the problem. I am concerned that at some later date I might want some other gadget in the wing cavety. Maybe not enough room for more wires. I am contemplating putting an aluminum conduit in, and fishing more wires as needed.
Am I off base here? |
Instead of putting in a conduit, do what I did after a suggestion from my tech counselor on my first plane. Just run some additional wires now with extra length outboard and to pins in a connector inboard. Turns out I used my extra wire when I retrofitted to LED lights and needed a sync wire.
I would suggest a 16-18 ga wire and a 20-22 ga wire in each wing. It will weigh less than the conduit and you can use them if you ever need them in the future. Worked great for me and I plan on doing the same in this plane. |
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