The term "Repairman Certificate" has a broader definition than that used in homebuilding. Per 14CFR 65.103, "A certificated repairman may perform or supervise the maintenance, preventive maintenance, or alteration of aircraft or aircraft components appropriate to the job for which the repairman was employed and certificated, but only in connection with duties for the certificate holder by whom the repairman was employed and recommended. "
Originally Posted by 1600vw
For the non-homebuilding world, a Repairman Certificate is typically issued to an employee of an FAA-certified Repair Station or an Air Carrier to permit him or her some authority in a fairly narrow area. The employer must vouch that the person has been appropriately trained and is qualified for the specific task they are to do. An A&P can work on everything, a Repairman Certificate holder, in comparison, might be authorized only to remove, balance, and replace control surfaces.
The Repairman Certificate for Experimental Amateur-Built aircraft is covered in 14CFR 65.104.
(a) To be eligible for a repairman certificate (experimental aircraft builder), an individual must—
(1) Be at least 18 years of age;
(2) Be the primary builder of the aircraft to which the privileges of the certificate are applicable;
This is different from the Repairman Certificates issued for Light Sport Aircraft, which are defined in 14CFR 65.107:
(b) The holder of a repairman certificate (light-sport aircraft) with an inspection rating may perform the annual condition inspection on a light-sport aircraft:
(1) That is owned by the holder;
(2) That has been issued an experimental certificate for operating a light-sport aircraft under §21.191(i) of this chapter; and
(3) That is in the same class of light-sport-aircraft for which the holder has completed the training specified in paragraph (a)(2)(ii) of this section.
So if you take the appropriate course (16 hours long), you can perform the condition inspection of any ELSA that you own.