8.1 A companion hatch opening from a cockpit or
recess, which gives access to spaces below the weather deck shall
be fitted with a coaming, the top of which is at least 300mm (12 inches)
above the sole of the cockpit or recess.
8.2 When washboards are used to close a vertical
opening they shall be so arranged and fitted that they will not become
accidentally dislodged.
8.3 The breadth of the opening of a companion
hatch shall not exceed 1 m (39 inches).