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Elements and Performance Criteria

1. Calculate stability
   • Vessel stability data book is made available and checked for endorsement
   • Data is interpreted to determine safety parameters for vessel
   • Stability is accurately calculated using data extracted from vessel stability data book
   • Stability calculations are checked to ensure they correlate with data set out in vessel stability book
   • Miscalculations or unsafe conditions are recognised and recalculated or checked
   • Calculated stability data is recorded using appropriate units and correct number of significant figures
2. Control vessel stress and stability
   • Information from vessel stability information is used to determine loading limits and displacement from draft
   • 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
   • Relevant stability information is correctly communicated to others as required
   • Stability conditions of vessel are managed in adverse weather conditions
   • Emergencies that may jeopardise vessel stability are recognised and appropriate action is taken
3. Maintain records of stability management
   • Data and information related to stability management is accurately recorded
   • Data and information related to stability management is filed and stored according to organisational procedures

Required Skills

Required Skills

Carry out basic calculations associated with maintaining vessel stability

Manage loading and weight distribution of vessel to ensure assigned load line conditions are not exceeded

Manage stability of vessel in a range of conditions

Recognise problems affecting vessel stability

Required Knowledge

Bilging and permeability

Centroids and centre of gravity

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

Dockwater and freshwater allowance

Effects of free surface of liquids

Factors that affect the rolling period of vessel

Forces and moments

Information contained in stability data books

Loading and discharging weights

Principal stresses that act on the structure of a vessel

Principles of vessel stability

Procedures for carrying out basic calculations associated with vessel stability

Relationship between light displacement loaded displacement and deadweight tonnage

Stability curves

Steps involved in bring an unstable vessel to a stable condition

Tonnes per centimetre immersion TPC

Transverse and longitudinal dynamics

Work health and safety WHSoccupational health and safety OHS requirements and work practices

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria the required skills and knowledge the range statement and the Assessment Guidelines for the Training Package
Critical aspects for assessment and evidence required to demonstrate competency in this unit	The evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the Elements Performance Criteria Required Skills Required Knowledge and include attention to appropriate level of detail in recordkeeping producing reliable documentation
Context of and specific resources for assessment	Performance is demonstrated consistently over time and in a suitable range of contexts Resources for assessment include access to industryapproved marine operations site or simulation where managing stability of a vessel up to metres may be demonstrated tools equipment and personal protective equipment currently used in industry relevant regulatory and equipment documentation that impacts on work activities range of relevant exercises case studies andor other simulated practical and knowledge assessments appropriate range of relevant operational situations in the workplace In both real and simulated environments access is required to relevant and appropriate materials and equipment applicable documentation including workplace procedures regulations codes of practice and operation manuals
Method of assessment	Practical assessment must occur in an appropriately simulated workplace environment andor appropriate range of situations in the workplace A range of assessment methods should be used to assess practical skills and knowledge The following examples are appropriate to this unit direct observation of the candidate managing stability of vessel up to metres direct observation of the candidate applying relevant WHSOHS requirements and work practices
Guidance information for assessment	Holistic assessment with other units relevant to the industry sector workplace and job role is recommended In all cases where practical assessment is used it should be combined with targeted questioning to assess Required Knowledge Assessment processes and techniques must be appropriate to the language and literacy requirements of the work being performed and the capacity of the candidate

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Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below.
Stability calculations must include:	Correlation against stability book data Draft Final KG Trim
Loading limits may include:	Not exceeding allowable passenger carrying capacity and distribution Not exceeding vessel designed cargo carrying capacity Understanding the effect of fuel, fresh water and ballast on cargo capacity
Emergencies may include:	Cargo shift Damaged hull Flooding of cargo spaces

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