This is the root rib on a horizontal stabilizer. The rivets that fasten the rib to the spar are completely missing!
In Case You Missed It
When the Rooster Flies
Geoff Jones - 1
Just because real roosters don't fly doesn't mean that a 100%-original aircraft designed and painted to resemble one wont.
Improper Bolt Length
A bolt should extend beyond the nut by 1–3 threads. If it is any...
2013 Rotorcraft Buyers Guide
If flying a rotorcraft is your goal, this is a great time to start exploring your options—there’s been growth in this segment, and even more expansion is on the horizon. By Roy Beisswenger.
Metal Magic: Driving and Squeezing Countersunk Rivets
Paul Dye explains how to both drive and squeeze flush rivets and offers handy tips to getting good, repeatable results.
In the total picture this is not necessarily unairworthy. Yes this is an over site by the builder but in the total picture the fasteners in the rib to skin and skin to spar probably provide the necessary strength to carry the normal flight loads. This condition needs to be corrected and probably before the next flight but to call it unairworhty is an overstatement.
I use the little feature anymore to highlight problem areas. 🙂
Yes, but look how nicely the bolts are marked with torque seal….so much attention to detail he missed the rivets! Form over substance. Yikes!!!