Hidden function

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A function whose failure will not be evident to the operating personnel during the performance of normal duties.

Condition-monitoring process
In current regulatory usage, a maintenance process characterized by the absence of scheduled-maintenance tasks. Items (including those with hidden functions) remain in service until a functional failure occurs, and analysis and surveillance programs monitor their overall reliability.
Hidden-function item
Any item whose functions include a hidden function.

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About Fred Schenkelberg

I am the reliability expert at FMS Reliability, a reliability engineering and management consulting firm I founded in 2004. I left Hewlett Packard (HP)’s Reliability Team, where I helped create a culture of reliability across the corporation, to assist other organizations.

About Fred Schenkelberg

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