The first step in an FMEA study is a detailed study of the
system to be analysed through the use of drawings and equipment manuals.
A narrative description of the system and its functional requirements
shall be drawn up including the following information:
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.1 general description of system operation and
structure;
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.2 functional relationship among the system elements;
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.3 acceptable functional performance limits of
the system and its constituent elements in each of the typical operational
modes; and
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.4 system constraints.