169.313—Means of escape.
(a)
Except as provided by paragraph (f) of this section, there must be at least two means of escape from all areas generally accessible to persons onboard. At least one means of escape must be independent of watertight doors and lead directly to the open deck. Windows and windshields of sufficient size and proper accessibility may be used as one avenue of escape.
(b)
The two means of escape must be as widely separated as practical to minimize the possibility of one incident blocking both escapes.
(c)
Except as provided by paragraph (d) of this section, a vertical ladder and deck scuttle may not be designated as one of the means of escape.
(4)
The scuttle is fitted with a quick-acting release and a hold-back to hold the scuttle in an open position.
(f)
Where the length of the compartment is less than 12 feet, one vertical means of escape is acceptable provided that—
(1)
There is no source of fire in the space, such as a galley stove, heater, etc., and the vertical escape is remote from the engine or fuel tank space, and
(2)
The arrangement is such that the installation of two means of escape does not materially improve the safety of the vessel or those on board.
(4)
Except when unavoidable obstructions are encountered, there must be at least 4 1/2 inches clearance above each rung.