Airworthiness Directives; Boeing Model 747SP and 747SR; 747-100B, -200B, -200C, -200F, -300, -400, and -400D; and 767-200 and -300 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing transport category airplanes. This action requires inspection of the attachment of the shoulder restraint harness to the mounting bracket on certain observer and attendant seats to determine if a C-clip is used in the attachment, and corrective action, if necessary. This action is necessary to prevent detachment of the shoulder restraint harness of the attendant or observer seat from its mounting bracket during service, which could result in injury to the occupant of the seat. This action is intended to address the identified unsafe condition.