Division .7.8 F1
United Kingdom
A single electrical failure in the power operating or control system of a power-operated sliding watertight door shall not result in a closed door opening. Availability of the power supply should be continuously monitored at a point in the electrical circuit as near as practicable to each of the motors required by paragraph .7.3. Loss of any such power supply should activate an audible and visual alarm at the central operating console at the navigating bridge.