Where a surveyor determines that the condition of a ship, including its structure, machinery and equipment, does not correspond substantially with the particulars on a certificate, or is such that the ship is not fit to proceed to sea without danger to the ship or persons on board, he will advise the owner or master of the corrective action required, and will notify the Certifying Authority (e. g. the classification society). If the corrective action is not taken within a reasonable period, the relevant certificate will be suspended. The MCA will give notice of the suspension to the owner, the surveyor and to the Certifying Authority, who must in turn inform the master.