GM3 ATS.OR.205(a)(2) Safety assessment and
assurance of changes to the functional system
ED Decision 2017/001/R
The following non-exhaustive list contains examples of safety requirements that specify:
(a) for equipment, the complete behaviour, in terms of functions, accuracy, timing, order, format, capacity, resource usage, robustness to abnormal conditions, overload tolerance, availability, reliability, confidence and integrity;
The complete behaviour is limited to the scope of the change. Safety requirements should only apply to the parts of a system affected by the change. In other words, if parts of a system can be isolated from each other and only some parts are affected by the change, then these are the only parts that are of concern;
(b) for people, their performance in terms of tasks (e.g. accuracy, response times, acceptable workload, reliability, confidence, skills, and knowledge in relation to their tasks);
(c) for procedures, the circumstances for their enactment, the resources needed to perform the procedure (i.e. people and equipment), the sequence of actions to be performed and the timing and accuracy of the actions; and
(d) interactions between all parts of the system.
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