Legal question

[Tralika]

I don't know why the builder you are "helping" would not be able to obtain a Repairman's Certificate. The DAR that does the final inspection and issues the airworthiness certificate will have nothing to do with the process to obtain the Repairman's Certificate. The "builder" takes the AW certificate, build log and a Form 8610-2 to the local FSDO. In my case, it was obvious that the folks at the FSDO had no experience with Experimental Amateur Built aircraft. They thumbed through my build log and asked me a few questions about the build process. The questions were very similar to questions I've gotten from non-pilots. They asked no questions about maintenance or inspection requirements on my plane. After making sure the form was filled out properly they issued my Repairman's Certificate.

If you don't want the builder you are helping to obtain a Repairman's Certificate I think the only way to do it is to apply for the Repairman's Certificate yourself. Since only one certificate is issued for each aircraft he will not be eligible if you get there first. Also keep in mind that there is no time limit on when the to apply for the Repairman's Certificate. If your builder says he does not want a Repairman's Certificate, he can change his mind and apply a year or two later.