Can a STC holder also be the TC holder?

[biz-buz]

Technical question please. I am looking at a project where there is a question of whether a STC holder can also be the TC holder for the aircraft type envolved with the STC?

I thought that if the TC holder wanted to modifly his own aircraft, then he had to go the optional equipment route, but if a different business entity owned the STC, then that was OK.

Any ideas on the relevant legislation would be good, as I have looked around for a precise text and cannot find any, either FAA or EASA.

[john_tullamarine]

I can't recall ever seeing anything which precluded an OEM TC raising an STC mod ..

[biz-buz]

Thanks John, me neither but not sure if this is actually written down somewhere or is just custom and prcatice?

Sorry for the delay but no longer get a nudge when I get a reply.