Kyleb wrote:
I can tell you that the Aeronca community (primarily the thousands of post-war Champ and Chief owners, including the L-16 folks) are struggling with the wing rib problem. The aircraft uses 5 aileron bay ribs per wing and 7 main wing ribs per wing. Original ribs are now 65 years old and are worn out. It would require two sets of dies to press these ribs since the aileron bay ribs and the main ribs interchange between the left and right wings.
There are PMA'd new ribs, but they are configured for the later aircraft - late Champions, Citabrias, etc. and are pre-punched for 1/8" pop rivets to attach the fabric. That isn't an allowed modification on the early Champs and Chiefs, so the new ribs have to be patched so they can work with the PK screws which are correct for the aircraft. That is insult to injury - you spend $100 on a replacement rib, then have to spend an hour or two modifying it so it'll work. Also, the new ribs are from .032" aluminium, not .020", like the originals, so you're adding weight to an aircraft that can't afford it.
If someone could produce PMA'd ORIGINAL style ribs (or non-PMA'd ribs, under the "owner produced parts" rules), that would make a lot of Aeronca owners very happy. I imagine you could sell hundreds per year...
PM me and I can send you factory drawings of the ribs.
PM me and maybe that is something we can look into. If the parts are not attached to an AD, then it would be real easy to add to our PMA.