General Organization of Part 4 Part 4 contains classification requirements for machinery. These requirements are organized in two broad segments: that specific to equipment@ and that specific to systems. 4-1-1/Figure 1 shows the overall organization of Part 4. Requirements for Classification Scopes of Part 4 and Part 5C Part 4 provides the minimum requirements for machinery of self-propelled vessels of 90 meters in length and over. Compliance with Part 4 is a condition for classification of all such vessels@ and for assigning the appropriate machinery class notations indicated in 4-1-1/1.5. Additional requirements for machinery@ which are specific for each vessel type@ are provided in Part 5C. Compliance with the provisions of Part 5C is a condition for assigning the vessel type class notation specified therein@ such as Oil Carrier@ Passenger Vessel@ Liquefied Gas Carrier@ etc. Fundamental Intent of Machinery Rules (a) Propulsion and maneuvering capability. Part 4 of the Rules is intended to assure the propulsion and maneuvering capability of the vessel through specification of pertinent design@ testing and certification requirements for propulsion@ maneuvering and other equipment and their associated systems. See 4-1-1/Figure 1 for equipment and systems included in the scope. (b) Machinery hazards. Part 4 of the Rules is also intended to identify and address hazards associated with machinery aboard a vessel@ particularly those hazards which are capable of causing personal injury@ flooding@ fire or pollution. (c) Cargo hazards. Hazards associated with cargoes carried (such as oil@ dangerous goods@ etc.) or to the specialized operations of the vessel (such as navigating in ice) are addressed in Part 5C. Application Requirements in Part 4 are intended for vessels under construction; but they are to be applied to alterations made to existing vessels@ as far as practicable.