CAMO

From http://www.euroga.org/forums/maintenance-avionics/6043-ownership-checklist?page=1#108675:

CAMO is an abbreviation for "Continuing Airworthiness Management Organisation. They have nothing to do with maintenance, except that they check if all ADs and scheduled maintenance has been performed and the one signing for it has the right to do so. Then they issue an ARC. The physical review of the CAMO is purely checking compliance to the paperwork, the CAMO does not perform any technical checks as you would do in performing an annual. For instance if your aircraft’s maintenance manual prescribes a 50h check that can be performed by the pilot-owner of the aircraft, you don’t need any mechanic to perform the 50h check and release the aircraft into service.

There is, however, constant confusion about the role of the CAMO, because many maintenance organisations also perform the role of the CAMO, especially in smaller businesses. But the certifying staff wears a different shirt while maintaining the aircraft than while issuing the Airworthiness Review Certificate. In larger organizations this distinction makes much sense, because the mechanic can perform maintenance and has to to much less paperwork, and the CAMO is a job for a deskjockey with two left hands. However, if the organization is too small, things change, and EASA is on it’s way to change things for small airworthiness and maintenance organisations.

The pilot/owner cannot take over the CAMO, because he cannot issue an Airworthiness Review Certificate. But he can do quite a lot of maintenance himself and he can write the maintenance program to which the CAMO / Maintenance Organisation has to perform maintenance.