94.501—Applicability.
        
        (a) 
         The requirements of this subpart are applicable to manufacturers of engines subject to the provisions of subpart A of this part, excluding small-volume manufacturers.
    
    
        
        (b) 
         The provisions of subpart F of  40 CFR part 89 (Selective Enforcement Audit) apply to engines subject to the provisions of subpart A of this part.
    
    
        
        (c) 
         Manufacturers may comply with the provisions of  40 CFR part 1042, subpart D, instead of the provisions of this subpart F.