53A. Manufacture, storage and distribution of all aircraft- The manufacture, storage and distribution of aircraft, aircraft components and items of equipment or any other material used or intended to be used in an aircraft, whether or not a certificate of airworthiness has been or is required to be issued, renewed or rendered valid for such aircraft, under these rules, shall be undertaken and certified only by approved organisations, by licensed engineers or by authorised persons in this behalf. The form and manner and the distribution of the certificate and its copies and preservation thereof shall be as may be specified by the Director-General.