153.912—Certificate of inhibition or stabilization.
        
        (a) 
         When a cargo in Table 1 is referred to this section, no person may operate a tankship carrying the cargo without a written certification, carried on the bridge of the tankship, from the shipper that the cargo is:
    
    
    
    
    
    
    
    
    
    
        
        (6) 
         The action to be taken should the duration of the voyage exceed the inhibitor's or stabilizer's useful life.