In this Part the following expressions have the following meanings respectively unless the context otherwise requires—

• “doors” includes bow visors and appliances described in regulation 28(1)(c);

• “length” means the ship’s overall length;

• “loading doors” means the doors described in regulation 28(1)(a) to (d) inclusive; and

• “locked” means secured by a device which prevents unauthorised operation.

A door shall be deemed to be above the margin line if the sill of the opening with which it is associated is above that line.