Description: Period of time during which maintenance actions are performed on an item either manually or automatically, including the time due to delays inherent in the maintenance action.; Name: mt
Description: Time interval when maintenance is carried out on an item including technical, logistic and internal administrative delays; Name: Maintenance time
Description: ten times the logarithm to the base 10 of the ratio of the sound power of a source, p, to a reference value, p0, expressed in decibels; Name: sound output level