All amateur built experimental aircraft must have an annual “condition” inspection very similar to an “annual” inspection. This inspection can be performed by the original builder who is or was in essence the “manufacturer” of the aircraft or a certificated Airframe and Powerplant Mechanic. The aircraft is inspected to verify that it is in “condition for safe flight”. Airworthiness Directives are not issued against these aircraft however there may be AD’s that should be looked at that apply to engines, propellers and other accessories installed on the aircraft. The aircraft’s airworthiness certificate may contain required equipment and/or placards that must be installed.