Micro VG kit is FAA STC approved.  The STC, Installation instructions, PMA approved parts, Loctite® AA 330™ adhesive and materials are included in the kit.  The STC approved installation is considered by the FAA to be a “Major Modification”, and therefore must have an I.A. licensed mechanic sign to verify the installation was performed correctly and to return the aircraft to service after the installation has been completed.