Division .5 Notwithstanding the provisions of paragraph .4, existing class B ships carrying more than 36 passengers when undergoing repairs, alterations, modifications and outfitting related thereto shall comply with the following:F1

all materials introduced to these ships shall comply with the requirements with regard to material applicable to new class B ships; and

all repairs, alterations, modifications and outfitting related thereto involving the replacement of material of 50 tonnes or above, other than that required by Regulation II-2/B/16, shall comply with the requirements applicable to new class B ships.