Section 91.325 - Primary category aircraft: Operating limitations(a) No person may operate a primary category aircraft carrying persons or property for compensation or hire.(b) No person may operate a primary category aircraft that is maintained by the pilot-owner under an approved special inspection and maintenance program except- (2) A designee of the pilot-owner, provided that the pilot-owner does not receive compensation for the use of the aircraft.Doc. No. 23345, 57 FR 41370, Sept. 9, 1992