The failure of an aid to navigation to function exactly as described in the light list.
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CONTAMINANT FAILURE
Any loss of performance due to the presence of contamination. Two basic types of contamination failure are: Perceptible - gradual loss of efficiency or performance, and Catastrophic - dramatic, unexpected failure.
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EMISSION SPECTROMETER
Works on the basis that atoms of metallic and other particular elements emit light at characteristic wavelengths when they are excited in a flame, arc, or spark. Excited light is directed through an entrance slit in the spectrometer. This light penetrates the slit, falls on a grate, and is dispersed and reflected. The spectrometer is calibrated by a series of standard samples containing known amounts of the elements of interest. By exciting these standard samples, an analytical curve can be established which gives the relationship between the light intensity and its concentration in the fluid.
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GROUP OCCULTING LIGHT
An occulting light in which the occultations are combined in groups, each group including the same number of occultations, and in which the groups are repeated at regular intervals. The intervals of light separating the occultations within each group are of equal duration and this duration is clearly shorter than the duration of the interval of light between two successive groups.
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HAND LEAD
A light sounding lead (7 to 14 pounds), usually having a line of not more than 25 fathoms
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GROUP QUICK LIGHT
A quick flashing light in which a specified group of flashes is regularly repeated
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BURST PRESSURE RATING
The maximum specified inside-out differential pressure that can be applied to a filter element without outward structural or filter-medium failure.
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CATASTROPHIC FAILURE
Sudden, unexpected failure of a machine resulting in considerable cost and downtime.
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FLOW FATIGUE RATING
The ability of a filter element to resist a structural failure of the filter medium due to flexing caused by cyclic differential pressure.
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FATIGUED
A structural failure of the filter medium due to flexing caused by cyclic differential pressure.
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FLUID OPACITY
Related to the ability of a fluid to pass light.
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