An issue with the center wing spar rib stations presented when fitting the rear ribs. The spar rivet holes are pre-drilled and the flange on the rear rib is not. I noticed that the top and bottom spar web rivet positions were very close to the ends of the rear rib flange, violating the 3 diameter minimum 2 diameter rule for rivets. I spoke with Roger at the factory. and the top and bottom rivets are useless. As a solution, another rivet hole is added at the top and bottom of the rib station thru the nose rib, center wing spar web and the rear rib flange. I also clipped the rear rib flange at the top and bottom to eliminate the offending rivet hole from the rear rib. When complete there are seven A5 rivet positions at the rib station instead of five. Seven rivets hold the nose rib flange to the spar web and five of the rivets hold the rear web flange to the spar web. I have a TD and the nose ribs containing the gear slides already had the extra rivet positions pre-drilled, therefore I only needed to clip the offending rivet positions from the rear ribs. Pictures below show the problem and the solution.

Views: 56

Comment

You need to be a member of Zenith Aircraft Builders and Flyers to add comments!

Join Zenith Aircraft Builders and Flyers

Comment by Bradford Drown on September 27, 2019 at 8:04pm

Thanks Bob!

Comment by Bob Pustell on September 24, 2019 at 10:30pm

Fix one problem at a time. Well done, Brad!

New from Zenith:

Zenith Planes For Sale 
 

Classified listing for buying or selling your Zenith building or flying related stuff...

                                                     

Weather Maps


Custom Instrument Panels
for your Zenith
:

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.


Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits


Zenith Apparel from EAA:


Zenair Floats


Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz


Builder & Pilot Supplies:

How to videos from HomebuiltHELP.com

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.

Aircraft Insurance:

 
 

West Coast USA:

Transition Training:

Pro Builder Assistance
 

Pro Builder Assistance

Aircraft Spruce & Specialty for all your building and pilot supplies!

© 2019   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service