(2) An apparatus assignment issued under this section may be subject to such conditions as the Commission may impose. 165. Apparatus assignment to comply with spectrum plan. An apparatus assignment shall not be issued unless it is consistent with the spectrum plan developed under this Part. 166. Situation where apparatus assignment shall not be issued. The Commission shall not issue an apparatus assignment for the use of a spectrum that has been determined for spectrum assignments. 167. Third party authorization. (1) A holder of an apparatus assignment may authorise a third party to operate a network facility which is the subject of an apparatus assignment. (2) The regulations made by the Minister under section 158 may provide for the third party operation of a network facility which is the subject of an apparatus assignment by persons authorised by the holder of the apparatus assignment. 168. Maximum term for an apparatus assignment. An apparatus assignment shall not be valid for a period of more than five years from its date of issue. 169. Class assignment. (1) The Commission may issue a class assignment which confers rights on any person to use any frequency band or bands for a specified purpose. (2) A class assignment issued under this section may be subject to such conditions as the Commission may impose. 170. Class assignment to comply with spectrum plan. A class assignment shall not be issued unless it is consistent with the spectrum plan developed under this Part. 171. Situation where class assignment shall not be issued. The Commission shall not issue a class assignment that authorises the use of the spectrum that is determined for spectrum assignments.