3.4.1 Measurements as specified in paragraphs
                           3.4.2, 3.4.3 and 3.4.4 relate to the ship in port condition.
                        
                        
                        
                      
                     
                     
                     
                        
                        
                         
                           3.4.2 When the noise from the ship's cargo handling
                           equipment may lead to noise above maximum levels in duty stations
                           and accommodation spaces affected by its operation, measurements should
                           be taken. Noise originating from sources external to the ship should
                           be discounted as indicated in paragraph 3.5.3.
                        
                        
                        
                      
                     
                     
                     
                        
                        
                         
                           3.4.3 Where the ship is a vehicle carrier and
                           noise during loading and discharging originates from vehicles, the
                           noise level in the cargo spaces and the duration of the exposure should
                           be considered in conjunction with chapter 5.
                           Such noise levels originating from vehicles may be estimated theoretically
                           by the shipyard and shipowners in cooperation with the Administration.
                           
                        
                        
                        
                      
                     
                     
                     
                        
                        
                         
                           3.4.4 Measurements shall be taken in machinery
                           spaces with the machinery operating in the port condition if the provisions
                           of paragraph 5.3.5 in respect of hearing
                           protection shall be met in lieu of the provisions of paragraph
                              4.2.1 during maintenance, overhaul or similar port conditions.