This Q&A is now closed and replaced with a new Q&A based on the latest upgrade drawings at

To all 601XL and 650 builders and aircraft owners. If you have a specific question regarding the upgrade, post it here and I will consult with Chris Heintz so that we can give you the best possible answer. Please be specific about your questions.

When posting a question or replying to an existing comment, PLEASE add it to end of the last page.

Zenith Aircraft is upgrading its 601 XL, so a lot of questions are answered on the step-by-step Blog Posts on this main page.

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Replies to This Discussion

I need to order a partial kit, I will be fabricating many of the parts myself. Please post a parts list with cost of each item.

Bob Reinero
San Diego CA.

I scratch built the stuff and it isn't worth it we have about $600 in it now and that doesn't include hardware so you will be much better off just buying the stuff from Zenith. They have to be in the red on these parts and I think we all owe them a huge thank you. It isn't many companies in avation that would do what they have done. Most parts you buy that need a required upgrade in avation will get you racked over the coals.

Leaving the airport now
I am stopping the Q&A and replacing it with a new one, based on the latest upgrade drawings of Nov. 24, 2009: We've updated the draft Drawings 6-ZU-1, 6-ZU-2, 6-ZU-3 and 6-ZU-4, and LAA Aileron Balance.
Thank you for all your excellent comments.
Mathieu Heintz
After talking to Roger about solid Rivets and the different ways to extract them without damaging the hole I have found a almost mistake free way to remove them. I will post the video I made of it on here tonight.

One Note: Everyone in the forum or building a airplane has a local EAA chaptor near you and if you go visit them they will guide you to someone that has a 4X rivet gun so don't be scared of the driven rivets. In 10 mins with the proper teacher you will be a pro at it. To rivet the wing spar back together takes about 30 mins and you will see after watching the video I will upload that you can do it.



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