| Measurements |  |
| Inspection To measure the value of multiple situational variables (measurements) that relate to a serialized item, and compare these to preset boundary values. Inspections can establish the necessity of maintenance activities. Reference activity related to a set of measurement types. Measurement Determination of the value of a particular dependent variable of a serialized item in a specific situation, for example, cooling water intake temperature. Unit of measurement A measurable (physical) variable and an identification of the unit of this variable, for example, pressure in kPa. Unit The indication in which the unit of measurement is expressed. Independent Variable Unit of measurement, which determines the dependent variable. Also known as the x-variable. Dependent Variable Unit of measurement, which together with a norm value (and a start value)determines when maintenance activities must be carried out. The value of this variable is determined when the measurement is executed. Also y-variable, this variable depends on the x-variable; y = f(x). Use Trend The estimated behavior of the value of the dependent variable, for example, the tread of a tire, as a function of the independent variable, for example, time. Possibilities include increasing, decreasing, cyclic increasing, cyclic decreasing, between limits, outside limits, or none. |