Safe_Design_Manufacture_Import_and_Supply_of_Plant.doc

Safe work australia members meeting 6 30 september

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SAFE WORK AUSTRALIA MEMBERS’ MEETING 6 30 SEPTEMBER 2010 PAGE 51 OF 52
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APPENDIX C – DESIGN SOURCES OF HUMAN ERROR The following table lists some human errors that may be associated with the use of plant and the possible causes due to poor design of the plant or systems of work associated with the plant. SAFE WORK AUSTRALIA MEMBERS’ MEETING 6 PAGE 52 OF 52 Common human errors Possible causes due to poor design Inadvertent activation of plant. Lack of interlocks or time lockouts. Lack of warning sign against activating equipment under specified damaging conditions. Several critical displays of information are too similar or too close together. Errors of judgement, particularly during periods of stress or high job demand. Job requires operator to make hurried judgements at critical times, without programmed back-up measures. Critical components installed incorrectly. Design and instructions are ambiguous on installation of components. Lack of asymmetrical configurations or guides on connectors or equipment. Inappropriate use or delay in use of controls. Critical controls are too close, similar in design, awkwardly located. Readout instrument blocked by arm when making adjustment. Labels on controls are confusing. Information is too small to see from operator's position. Inadvertent activation of controls. Controls easy to activate by brushing past or too close to other controls. Controls can be easily activated accidentally. Lack of guards over critical controls. Critical instruments and displays not read or information misunderstood because of clutter. Critical instruments or displays not in most prominent area. Design of many displays similar. Failure to notice critical signal. Lack of suitable auditory and visual warning to attract operator's attention to information. Plant operation results in unexpected direction or response. Activation direction of controls conflicts with population norms or expectancies. Lack of understanding of procedures. Instructions are difficult to understand. Following prescribed procedures results in error or incident. Written prescribed procedures not checked for accurate operation. Lack of correct or timely actions. Available information incomplete, incorrect or not available in time. Response time of system or plant too slow for making next appropriate action. Lack of automatic corrective devices on system with fast fluctuations. Exceeding prescribed limitations on load or speed. Lack of governors and other parameter limiters. Lack of warnings on exceeding parameters.
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