- (a) This section applies to each vessel with watertight doors in bulkheads made watertight in compliance with this chapter.
- (b) Except as provided by paragraph (c) of this section, each watertight door must comply with subpart H of part 170 of this chapter.
(c) A Class-1 door may be installed at any place if—
- (1) The door has a quick-acting closing-device operative from both sides of the door;
- (2) The door is designed to withstand a head of water equivalent to the depth from the sill of the door to the bulkhead deck or 3 meters (10 feet), whichever is greater; and
- (3) The vessel's pilothouse contains a visual indicator showing whether the door is open or closed.
- (d) Each watertight door must be marked in compliance with § 131.893 of this chapter.
- (e) If a Class-1 door is installed, the vessel's stability letter will require the master to ensure that the door is always closed except when being used for access.