21.607—General rules governing holders of TSO authorizations.
         Each manufacturer of an article for which a TSO authorization has been issued under this part shall—
    
    
    
        
        (b) 
         Conduct all required tests and inspections and establish and maintain a quality control system adequate to ensure that the article meets the requirements of paragraph (a) of this section and is in condition for safe operation;
    
    
        
        (c) 
         Prepare and maintain, for each model of each article for which a TSO authorization has been issued, a current file of complete technical data and records in accordance with  § 21.613; and
    
    
        
        (d) 
         Permanently and legibly mark each article to which this section applies with the following information: