Amendment of Rules for windows located higher than the third tier above the freeboard deck and forward of the midship Full-text PDF:TEC- 1087 (31kb) Contact:Hull Department Issued:14 Sep 2016 ClassNK has investigated behaviour of waves acting on windows located considerably above the freeboard deck of ships where the navigation bridges are located forward of the midship, such as onboard Ro-Ro cargo ships. As a result of the investigation, it has been found out that there is possibility waves can hit the windows located considerably above the freeboard deck due to waves rolling over the foredeck and running up along the front walls, even though the wave height may not be so high that the wave directly reaches the windows. In fact, cases have been confirmed in which navigation bridge windows seem to have been damaged by the aforementioned phenomenon. Based on these results, ClassNK amended the relevant Rules to provide the minimum design pre