Notify the individuals responsible of the areas to be inspected; they may have information relevant to the inspection, such as equipment that is down or other existing known hazards. Where appropriate, arrange for specialists such as maintenance personnel, industrial hygienists, or engineers to be available.
It cannot be emphasized enough that an unplanned inspection is not to "catch people off guard," but rather to correct substandard acts and substandard conditions.
Wear or be equipped with appropriate PPE for the areas you will be inspecting. If the prescribed PPE is not available, note it on the inspection report and do not enter that area.