As for experimental, racing aircraft, who can do maintenance and sign it off is specified in the Operating Limitations that accompany the special airworthiness certificate. The few such aircraft I am familiar with have operating limitations that are basically the same as experimental, amateur-built.
As for experimental, amateur-built aircraft, unless it is specifically prohibited by the Operating Limitations (and I have never, ever, seen such a restriction), anybody or any creature may perform any maintenance, repairs, or modifications on the aircraft and sign them off. Anybody. Or any creature.. Being human is not a requirement:
http://www.wanttaja.com/avlinks/MAINT.HTM
For some major repairs or modifications, you are required to notify the FAA, and they push you back into your Phase I testing for a while. But, again, anybody can do those repairs or modifications.
The only privilege conferred by the repairbeing certificate is that of conducting and signing off the annual condition inspection. That's it. That inspection can also be conducted by an A&P; IA certification is not required.
Thanks, Bob K.
On Sunday, December 15, 2013 3:45:52 PM UTC-8, wrote:
I know this is an old post but I have a DG 400 (experimental) and think there might be fundamental misunderstanding of experimental aircraft and maintenance practices. In the USA there in NO difference regarding standard or experimental aircraft regarding 'owner accomplished' maintenance unless the owner also built the aircraft. Unless you built your ship (I don't know of any owner built glass ships) you fall under identical maintenance FAR 43 requirements as a standard airworthiness aircraft regarding owner done maintenance, there are 31 items an owner can accomplish. Experimental none owner built doesn't really do much as far as maintenance practices.. it just really means your annual is called a condition inspection and can be done by a AP not an IA... that's about all it does.