
339Chapter fteen: Analyze
FTA over FMEA when
• Safety of public, operation and maintenance is the rst priority.
• Identication of a small number of differentiated events can be done.
• Critical importance to the completion of functional prole is given.
• Errors by humans and software provide a high potential of failure.
• Quantied risk evaluation is the primary concern.
• Highly complex or highly interconnected product functionality
• Once initiated product is not repairable.
FMEA over FTA when
• The top events are limited to a small number.
• There is a feasibility for multiple potentially successful functional proles.
• Determining the ...