MAINTENANCE TERMS AND DEFINITIONS ( Part 3)

·         Inspection: The qualitative observation of an item’s performance or condition.

·         Availability:  The probability that an item is available for use when required

·         Mission time:  The time during which the item is carrying out its assigned mission

·         Downtime:  The total time during which the item is not in satisfactory operating state

·         Logistic time:  The portion of downtime occupied by the wait for a required part or tool

·         Failure:  The inability of an item to operate within the defined guidelines

·         Serviceability:  The degree of ease or difficulty with which an item can be restored to its working condition

·         Redundancy:  The existence of more than one means for accomplishing a stated function

·         Failure mode:  The abnormality of an item’s performance that causes the item to be considered to have failed

·         Human reliability:  The probability of accomplishing a task successfully by humans at any required stage in the system operation with a given minimum time limit (if the time requirement is stated)

·         Useful life:  The length of time a product operates within a tolerable level of failure rate

·         Continuous task:  A task that involves some kind of tracking activity (e.g., monitoring a changing situation)

·         Human performance:  A measure of human functions and actions under some specified conditions

·         Active redundancy:  A type of redundancy in which all redundant units are functioning simultaneously

·         Human error:  The failure to carry out a specified task (or the performance of a forbidden action) that could result in disruption of scheduled operations or damage to property or equipment