EAAAirVenture OshkoshShopJoin

De-register, 51% or more rebuild, re-register, new airworthiness

Posted By:
Ricky Thomason
Homebuilder or Craftsman
#1 Posted: 5/18/2010 10:45:55

I've purchased a truck load of aircraft parts that used to be an Avid Amphibian/Catalina. The plane was once complete and registered with an N number and did receive an airworthiness certificate. The data plate is in one of the boxes of parts.

My question is, what would be the procedure for me to build these parts into a new experimental/homebuilt? I have built 2 planes from kits and have some knowledge of the process when you buy a kit but not sure how to handle this situation.

In reality, I will probably wind up doing more of the construction of parts going this route than I would have if I had been able to buy an unfinished kit.

I would document the build process hoping to be able to get the repaiman certificate when I'm finished.

Any information will be appreciated.



Joe Norris
Vintage Aircraft Association MemberYoung Eagles Pilot or VolunteerHomebuilder or CraftsmanAirVenture Volunteer
#2 Posted: 5/18/2010 15:52:13

Ricky (and anyone else with a similar question),

Please call me and discuss this.  This is not a subject that can be easily covered in a forum post.  Call me toll-free at 888-322-4636.  Ask for Joe.



Lasciate ogne speranza, voi ch'intrate
Mike Clayton
Young Eagles Pilot or VolunteerHomebuilder or Craftsman
#3 Posted: 5/24/2010 08:51:43


I have a similar situation with a Kitfox II.  I have been in communication with the FAA folks in Oklahoma City, and found them to be very helpful.  As it was explained to me, I can approach the project as though I am the original builder, and then get the aircraft registered, and get a new airworthiness certificate.  However, I will need to make sure that the last owner of the aircraft requests that the aircraft be de-registered.  If I want to keep the same N-Number, the last owner has to request that it be reserved for my use, and I have to then work with the FAA to get the number assigned to me.  I will also have to establish that I actually did construct 51% of the aircraft.  In my case, I am working with the new checklist, and the original parts inventory for the KitFox II kit, to establish my point of departure.  I am fabricating some of the parts that came in the original kit as new parts, due to unavailability, or high cost.  I pretty much started with the same inventory list as the original aircraft. except I am going with a completely different engine, and so there will be a lot of new construction there.  My impression is that there are no guarantees, but as long as you can build a solid case for compliance with the 51% rule, you should be OK.

I agree with Joe Norris that you should take this offline, as it is a complex subject.  I spent the better part of six months running this to ground until I made the correct contacts in Oklahoma City.


Mike Clayton