Wing root fittings

[waltermrich]

Im in need of a front and rear spar attach fitting ( the two fittings that attach the wing to the fuselage at the root end) any help would be appreciated

[Hank Jarrett]

Re: Wing root fittings

http://www.ebay.com/itm/Piper-Cub-Ta...ZZXCXo&vxp=mtr The step is Taylorcraft as well as the part just under it (strut to spar attach fitting). Several other parts may be Taylorcraft but can't tell from a photo. I have a full set we could use to make copies if you need it, but it would be less expensive to get used than copies. I will be blasting mine for one of my projects but won't be using them for a while if you want to go with replicas. Let me know.

Hank

[waltermrich]

Re: Wing root fittings

Thanks for the offer Hank we just returned from Oshkosh so did not see your message . Some one has offered them to me so Im Ok. Thanks

[Hank Jarrett]

Re: Wing root fittings

I will probably do drawings of mine if no one has them already. Better to have a drawing while the fittings are off than to have to wait for someone to tear down a wing so we can make a set. Our used parts supply is going the way the New Old Stock supply did. Pretty soon the only way to get these parts will be to make them.
We really need to create a stash of drawings of these parts. They don't need to be super engineering drawings! Just the info needed to make a replacement. Anyone want to start a database?

Hank

[PA1195]

Re: Wing root fittings

Has the tech and cost of 3-D scanning and software evolved to where digital copies are feasible? It would seem that would be the way to store the part's dimensions for sharing and reconstruction.

Couple of years ago I visited this facility (https://www.airforms.biz) and watched them make parts. I realize they have expensive equipment and training but maybe there's a way to make the replacement process better.

Gary

[Hank Jarrett]

Re: Wing root fittings

One problem is that to make parts you need to show they aren't available any more. Isn't Taylorcraft in Mexico still claiming they produce parts (even though I know of NO ONE who has ever gotten one from them)?

For owner produced parts you need to show YOU did one of the parts of making the part, the drawing, making or inspecting of the part you want to use. Read up on the rules for owner produced. If you get a company to make it they have to be "approved" and that is an expensive process. I have made many parts on restorations and I usually do the drawing, make all the parts and do a quality inspection that I can show to the Feds to show them that I made a part as good as the factory did. It is a lot of work and if anyone else cut out the sub assemblies or did welding or drew up something for me there are a LOT more questions. Work it out with your IA and FISDO FIRST! Make sure you do it like they want it so it is approved when done.

[PA1195]

Re: Wing root fittings

If unavailable means can't procure then that's true for some parts. Some parts are already in the owner built chain by being offered for sale. It's then up to the owner and 337 originators to confirm the product meets OEM specs. But how do we do that without substantiating data? Blueprints gathering bat and mouse poop in a Midwestern shed help no one.

My question and suggestion is by following AC 21-29, 23-27, and among others this: (https://www.savvyaviation.com/wp-con...uced-parts.pdf) capture via 3-D scanning the art of the part in the form of dimensions. Then determine the fit, function, and original material used then supervise or get involved with the building process. Of course include the approving personnel up front.

Without a part or factory print in hand to duplicate then a digitized file might accurately define the original dimensions. Is this feasible was my original question.

Gary

[skip]

Re: Wing root fittings

One problem is that to make parts you need to show they aren't available any more. Isn't Taylorcraft in Mexico still claiming they produce parts (even though I know of NO ONE who has ever gotten one from them)?

For owner produced parts you need to show YOU did one of the parts of making the part, the drawing, making or inspecting of the part you want to use. ....

The hard part is that somewhere in the genealogy of an owner produced part must be "approved data". I rebuilt my wings with new spars a few years ago. The original wing root fittings had been used as a "drill guide" for the larger phenolic bushings required by the C-85 upgrade in STC SA1-210 and they were yowzled out to the point where some of the bolt holes were 50% oversize ovals. The plane had flown for 30 years in that condition, but it was clear to me that the spar root fittings had to be re-done. STC SA1-210 includes drawings of the root fittings and these are approved data. Having the approved data is one of the required pieces needed for owner-produced parts and so this allowed me to produce new fittings. It is not difficult to lay out and drill the straps and then weld the inner piece. The STC does have a lot of interesting drawings included.

As Hank says, coordinate with your IA before you start. He is the one who needs to sign the stuff off.

[M Towsley]

Re: Wing root fittings

Yowzled-out is apparently wallered-out for us Midwestern folks. lol