Horizontal Stab Spar Mod by AntiSplatAero.com

[@thomasaltruda]

The Vans mod plates that Vans supplies is longer, and ties into the area beyond that first rib. I believe that’s where the strength is needed. Sure, this part is stronger, being made of stainless, however it’s too short! Any bending moment is being directed into the 2 rivets in the rib flange. Yes I know there are 4 rivets in the rib flange, but the two close to the centerline aren’t carrying the load like the outer ones are. I wouldn’t feel comfortable using this part without the row of rivets extended past the inboard ribs..that’s where the strength needs to be. This doubler will eventually shear those corner rivets. If I were doing a condition inspection where this was installed to repair cracking, I wouldn’t sign off on the plane without replacing this with the Vans SB repair.

[@jameshenry3530]

Perhaps builders could install the spar mods at the time when the wings are built and avoid the problem entirely.

[@FISHH00KS]

Van's has been providing the reinforcement plates in the kits since the problem was first found. If you need the plates, they're $8 for the set.

[@thomasaltruda]

This isn’t for the wings, it’s the horizontal stabilizer spar.