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Functional Failure ("F")
Also sometimes called "Complete Failure" but this is not ideal as a functional failure can sometimes precede complete failure.

When the density of deficiencies has exceeded a reasonably acceptable level and the assembly as a whole is now Beyond Economic Repair (BER).

The failure of an asset at some point after potential failure ("P") has occurred.

Functional failure is sometimes also referred to as end-of-life year.


Attributes and Consequences:
Listed below are some of the attributes of functional failure of an asset necessitates renewal.

  • Irrepairable - At this point, it is not practical or legal or cost effective to attempt maintenance or repairs.
  • Unmaintainable - The asset can no longer be maintained - is it unmaintainable.
  • Collateral Damage - Collateral damage may have occurred to other assets.
  • The owner is in a reactive management mode.


Examples of "F" Relative to the Forces of Retirement:
  • Expiration of funding thorough a product incentive product ("F" relative to economic obsolescence).
  • The deadline included in a safety order from an authority having jurisdiction ("F" in a case of legal obsolescence).
The loss of insurance coverage due to the degradation or recall of an asset. See also: risk management.
 

Examples and Defined Points:
Listed below are the functional failure milestone points under each of the six primary replacement driver scenarios, which are ranked in order of precedence:
In some cases, when safety is a concern, the functional failure may not be the actual failure point but a predetermined point that should not be exceeded due to the risk involved.


Anticipating and Measuring "F":
Listed below are some of the tools and techniques available to the asset manager in anticipating and preparing for functional failure of assets:
example of the progression from "P" to "F" along the P-F curve
Fig. An example of the progression from potential failure ("P") to functional failure ("F") along the P-F interval.


P-F interval illustrated with asphalt paving
Fig. The P-F interval illustrated with asphalt paving along the curve.


risk spectrum extending along the P-F interval
Fig. The risk spectrum extending along the P-F interval.


Decisions should consider the whole life of assets, including the I-P interval and the P-F interva
Fig. Decisions should consider the whole life of assets, including the I-P interval and the P-F interval.



Predictive maintenance (pdM) technologies along the P-F Curve in relation to Potential Failure (P) and Functional Failure (F)
Fig. Predictive maintenance (PdM) technologies along the P-F Curve in relation to Potential Failure (P) and Functional Failure (F).


The conceptual relationship between Functional Failure (F) and Potential Failure (P) on a P-F curve
Fig. The conceptual relationship between Functional Failure (F) and Potential Failure (P) on a P-F curve.


Conceptual representation of short-life assets, medium-life assets and long-life assets relative to their respective points of functional failure.
Fig. Conceptual representation of short-life assets, medium-life assets and long-life assets relative to their respective points of functional failure.


I. Care is trying to use a crystal ball to make forecasts about the deterioration of his assets
Fig. I. Care is trying to use a crystal ball to make forecasts about the deterioration of his assets.


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See also:
Compare with:

Survivor curve with the point of functional failure at the modal year (critical year).
Fig. Survivor curve with the point of functional failure ("F") at the modal year (critical year).

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