Failure Consequence – A statement of what chain of events follows
the occurrence of a failure. Same as Failure Effect
Failure Effect – A statement of what chain of events follows the
occurrence of a failure
Failure Finding – A scheduled tasks used to detect whether or not an
asset is in a failed state, generally used on protective systems.
Failure Mechanism – Failure mechanisms are the physical, chemical,
thermodynamic or other processes that result in failure. Failure
mechanisms are categorized as either overstress or wear-out
mechanisms.
Failure Mode – The event that leads to a failure
Failure Mode Effect Analysis (FMEA) – A logical, progressive method
used to understand the root cause of failures and their subsequent
effect on production, safety, and quality.
Failure Mode Effect Criticality Analysis (FMECA) – A logical,
progressive method used to understand the root cause of failures and
their subsequent effect on production, safety, and quality, which
quantifies the risk of the failure.
Failure Rate – The number of failures of an asset over a period of time.
Failure rate is considered constant over the useful life of an asset. It is
normally expressed as the number of failures per unit time. Denoted
by Lambda, failure rate is the inverse of Mean Time Between Failure
(MTBF).
Failure Reporting and Corrective Action System (FRACAS) – Is a
system, sometimes carried out using software, that provides a process
for reporting, classifying, analyzing failures, and planning corrective
actions in response to those failures.
Function – A quantitative state of what the asset or system is required
to perform
Functional Failure – The condition of an asset not being able to fulfill a
particular function at all or at the desired performance level.
Inherent – What the asset can initially accomplish, which is defined by
the design of the asset.
Karl Fischer Titration – Is a method in analytical chemistry that uses
coulometric or volumetric titration to determine trace amounts of
water in a sample.
Life Cycle Cost (LCC) – The total of all costs of the asset throughout its
entire life cycle, including all work done on or to the asset,
depreciation, and other costs of ownership; normally LCC take into
account the time value of money.
Maintainability (M) – The ease and speed with which a maintenance
activity can be carried out on an asset. Maintainability is a function of
equipment design and usually is measured by MTTR.
Mean Time Between Failures (MTBF) – MTBF is a basic measure of
asset reliability. It is calculated by dividing total operating time of the
asset by the number of failures over some period of time. MTBF is the
inverse of failure rate (Lambda).
Mean Time to Repair (MTTR) – MTTR is the average time needed to
restore an asset to its full operational condition upon a failure. It is
calculated by dividing total repair time of the asset by the number of
failures over some period of time. It is a basic measure of
maintainability.
On-Condition Task – Repair or restoration of an asset based on its
condition at the time; also known as condition-based maintenance
