1905.20—Notice of hearing.
        
        (a) Service.
         Upon request for a hearing as provided in this part, or upon his own initiative, the Assistant Secretary shall serve, or cause to be served, a reasonable notice of hearing.
    
    
    
    
    
    
    
        
        (c) Referral to hearing examiner.
         A copy of a notice of hearing served pursuant to paragraph (a) of this section shall be referred to the hearing examiner designated therein, together with the original application and any written request for a hearing thereon filed pursuant to this part.