Visible area means that portion of the input surface of the image receptor over which incident x-ray photons are producing a visible image.
Visible emissions means any emissions, which are visually detectable without the aid of instruments, coming from RACM or asbestos-containing waste material, or from any asbestos milling, manufacturing, or fabricating operation. This does not include condensed, uncombined water vapor.
Visible sheen means the presence of a film or sheen upon or a discoloration of the surface of the discharge. A sheen can also be from a thin glistening layer of oil on the surface of the discharge.
Technically permissible maximum laden mass means the maximum mass allocated to a vehicle on the basis of its construction features and its design performances.
Accessible surface means surface of equipment or of an equipment part that can be easily or accidentally touched by persons without the use of a tool.