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Identify and document system functions as a prerequisite to identifying failures and Failure Modes, and to developing effective maintenance strategies. Primary functions are the basic reason(s) that the system is acquired and installed. Secondary functions are usually less obvious, but can still have serious failure consequences and need to be understood. Define the function with a meaningful name and identify it with a function type of either Primary or Secondary. Quantify the functional performance in order to properly measure it.
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