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Elements and Performance Criteria

1. Data is interpreted to determine safety parameters for vessel
2. Stability is accurately calculated using data extracted from vessel stability data book
3. Stability calculations are checked to ensure they correlate with data set out in vessel stability book
4. Miscalculations or unsafe conditions are recognised and recalculated or checked
5. Calculated stability data is recorded using appropriate units and correct number of significant figures
6. Control vessel stress and stability
   • Information from vessel stability information is used to determine loading limits and displacement from draft
7. Vessel weight distribution is managed to maintain stability condition within safe limits at all times and regulatory requirements are complied with under all conditions of loading
8. Relevant stability information is correctly communicated to others, as required
9. Stability conditions of vessel are managed in adverse weather conditions
10. Emergencies that may jeopardise vessel stability are recognised and appropriate actions taken
11. Maintain records of stability management
    • Data and information related to stability management is accurately recorded
12. Data and information related to stability management is filed and stored according to organisational procedures

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment.

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria on at least one occasion and include: attending to appropriate level of detail in recordkeeping carrying out basic calculations associated with maintaining vessel stability which must include: dock water and freshwater allowance draft final height of the centre of gravity (CG) above the keel of a vessel trim final position of the longitudinal centre of gravity (LCG) free surface effect and vertical distance between keel and CG adjusted for free surface effect (CGf) metacentric height (GM) and GM adjusted for free surface effect (GMf) righting moments checking calculations to ensure correlation against stability book data managing loading and weight distribution of vessel to ensure assigned load line conditions are not exceeded.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of: bilging and permeability centroids and CG change of draught and trim (MCT) conditions of stable, neutral and unstable equilibrium and effects of disturbing vessel from upright construction features and stress characteristics for vessels density and specific gravity dock water and freshwater allowance effects of free surface of liquids emergencies, including: adverse weather and water conditions any other emergency identified by risk assessment that may affect stability cargo shift damaged hull flooding of cargo spaces factors that affect the rolling period of vessel forces and moments information contained in stability data books loading and discharging weights loading limits, including: not exceeding allowable passenger carrying capacity and distribution not exceeding cargo carrying capacity of the vessel the effect of fuel, freshwater and ballast on cargo carrying capacity maintenance of stability during firefighting operations principal stresses that act on the structure of a vessel principles of vessel stability problems affecting vessel stability procedures for carrying out basic calculations associated with vessel stability relationship between light displacement, loaded displacement and deadweight tonnage stability curves stability of vessel in a range of conditions stability terms and definitions steps involved in bringing an unstable vessel to a stable condition stress calculations tonnes per centimetre (TPC) immersion transverse and longitudinal dynamics trim and stress tables work health and safety (WHS)/occupational health and safety (OHS) requirements and work practices.

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