Why: Equipment deteriorates because of entropy changes, because of errors both overt and convert, and because of the use of incorrect procedures.

When: Maintenance is generally routine and recurring.

Where: The effort includes fault location, diagnosis, repair, test, adjustment, replacement, administration, and overhauls wherever equipment is located.

These definitions are written by H. Paul Barringer and are also posted on his web site at www.barringer1.com

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