# What are damage stability criteria for passenger ships as per SOLAS?

Passenger ships – Longitudinal extent of damage;

3m + 3% of L or, 11m whichever is least.
Where the required factor of subdivision is 0.33 or less the longitudinal extent must be increased to include flooding of any three consecutive compartments.

Passenger ships – Transverse extent of damage; 20% of B measured inboard from the ship’s side at right angles to the centreline at the level of the deepest subdivision load waterline taken parallel to the keel
Passenger ships – Vertical extent of damage; From the baseline upwards without limit
Any other damage; If any damage of a lesser extent would may cause a more severe condition regarding heel or loss of metacentric height, such damage shall be assumed for the purpose of the calculation
Passenger ships – When does the damage stability apply?; In the final stage after damage and after equalisation
Passenger ships damage stability – Residual area under curve; At least 0.015mr measured from the angle of equilibrium to the lesser of;
– Angle of flooding
– 22 deg from upright (one flooded compartment) or 27 deg from upright (two or more flooded compartments)
Passenger ships damage stability – Range of positive stability; At least 15 deg beyond angle of equilibrium
Passenger ships damage stability -Maximum GZ; Residual righting lever (GZ) value to occur within the range of positive stability when determined by the formula;
GZ(m) = heeling moment / displacement (+ 0.04)
When the heeling moment is taken as the greater value of any one of the following effects;
– Crowding of passengers to one side of the ship
– Launching of all fully loaded, davit launched survival craft on one side of the ship
– Pressure of wind on the side of the ship
In no case shall the GZ value so determined be less than 0.1m
Passenger ships damage stability – Assumed flooding; Sufficient intact stability in all conditions to withstand flooding of any 1 main compartment or;
-Where factor of subdivision is 0.33 – 0.5 to withstand the flooding of any 2 adjacent compartments or;
– Where factor of subdivision os 0.33 or less to withst