Abstract
With a view to maintenance, the concept of system testability is understood as the ‘intrinsic characteristic of a system or apparatus to permit means of internal self-diagnosis, or appropriate external instrumentation, to verify the functional efficiency and diagnose breakdowns'. This logistical parameter has been a matter of concern for some time now, and many figures of merit (FOM) have been defined for it in order to evaluate the quality of a system of self-diagnosis or to estimate how testable an apparatus is from outside.
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- 1.
These are go–no–go systems, which do not provide indications on the deterioration of peformance of the system in question, but only detect a fault that has already occurred: such is the case of luminous indicator lights (LED), which indicate the malfunction of a headlight. These systems are inexpensive and applicable even to non-essential components breakdowns of which will not involve a loss of the most important functions.
- 2.
Although there apparently are false alarms, they cannot logically be identified in this category, inasmuch as they could be identified as a false indication if the system of prognostics is on-line and integrated with the primary system (because the system of prognostics is part of the system itself and indicates at least a malfunction, if not a breakdown); while if the system of prognostics is off-line (not integrated), we are dealing in any case with an error of external analysis due to a shortcoming of the external process and not of the product.
- 3.
The word “dependable” in this context is understood in an exquisitely technical sense, as related to the rate of breakdown, because another definition of the word dependable could be… which is correct and precise, and in this sense other FOMs have already identified the quality of the System of Prognostics.
- 4.
LRU = Line Replaceable Unit.
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Fedele, L. (2011). Testability and Prognostics. In: Methodologies and Techniques for Advanced Maintenance. Springer, London. https://doi.org/10.1007/978-0-85729-103-5_6
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DOI: https://doi.org/10.1007/978-0-85729-103-5_6
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