122.720—Weekly maintenance and inspections.
         The following tests and inspections must be carried out weekly on a vessel:
    
    
        
        (a) 
         Each survival craft, rescue boat, and launching appliance must be visually inspected to ensure its readiness for use;
    
    
        
        (b) 
         Each rescue boat engine must be run ahead and astern for not less than 3 minutes, unless the ambient temperature is below the minimum temperature required for starting the engine; and
    
    
        
        (c) 
         Each battery for rescue boat engine starting must be brought up to full charge at least once each week if: