PART A | MANDATORY CRITERIA
CHAPTER 1 | GENERAL
1.1.1 The criteria stated under chapter 2 of this part present a set of minimum requirements that shall apply to cargo and passenger ships of 24 m in length and over.
1.1.2 The criteria stated under chapter 3 are special criteria for certain types of ships. For the purpose of part A the definitions given in the Introduction apply.
1.2 DYNAMIC STABILITY PHENOMENA
Administrations shall be aware that some ships are more at risk of encountering critical stability situations in waves. Necessary precautionary provisions may need to be taken in the design to address the severity of such phenomena. The phenomena in seaways which may cause large roll angles and/or accelerations have been identified here under.
Having regard to the phenomena described in this section, the Administration may for a particular ship or group of ships apply criteria demonstrating that the safety of the ship is sufficient. Any Administration which applies such criteria should communicate to the Organization particulars thereof. It is recognized by the Organization that performance oriented criteria for the identified phenomena listed in this section need to be developed and implemented to ensure a uniform international
level of safety.
1.2.1 Righting lever variation
Any ship exhibiting large righting lever variations between wave trough and wave crest condition may experience parametric roll or pure loss of stability or combinations thereof.
1.2.2 Resonant roll in dead ship condition
Ships without propulsion or steering ability may be endangered by resonant roll while drifting freely.
1.2.3 Broaching and other manoeuvring related phenomena
Ships in following and quartering seas may not be able to keep constant course despite maximum steering efforts which may lead to extreme angles of heel.
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