This specification covers the design, manufacture, and testing of sliding watertight door assemblies intended to ensure the watertight integrity of personnel access openings in watertight bulkheads. Sliding watertight doors consist of four types: type IA - horizontal doors, type IB - vertical doors, type IIA - horizontal doors, and type IIB - vertical doors. Watertight doors consist of three classes: class 1 - doors that are hinged and dogged, class 2 - sliding doors that are operable both locally and remotely by hand gear, and class 3 - sliding doors that are operable both locally and remotely by hand and by power. Hydrostatic test and visual examination shall be performed to meet the requirements prescribed.