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Section 2 Principles of Design and Construction
201. General principles
1. Submersibles are to be fitted with equipment for controlling depth, trim and positive and negative buoyancy. It is necessary to ensure that this equipment functions properly under all the specified conditions of heeling and trim including those liable to occur as the result of an accident.
2. All the operating units for controlling depth, trim and positive and negative buoyancy are to be grouped together and clearly marked, either on the control console or, in autonomous submersibles, at the diving control stand.
3. The control console or the diving control stand, as the case may be, is to be equipped with in- dicating instruments which show continuously the position of the submersible and the state of the depth, trim and positive and negative buoyancy controls.
202. Systems and components
1. The design and construction of systems and components for the control of depth, trim and positive and negative buoyancy are to comply with Ch 7 and Ch 9.
2. Control operating units and indicating instruments are subject to the Rules set out in Ch 13.
3. The dynamic depth control equipment is to be complied with Ch 11.
