The DEEP DRILLER is loaded as shown in the Sample Load Form Number 5 (Survival) when an unexpected slowly increasing starboard list and bow down trim occurs. A leak in 1S is found. By deballasting from ballast tanks 2S and 3S, the inclination slowly decreases. The increase in the longitudinal free surface correction is __________.
Official USCG Answer & Rule Citation
Correct Answer: Option C — 0.83 foot
Longitudinal free surface correction calculations depend on tank geometry, specifically the moment of inertia of the free liquid surface divided by the total displacement. Deballasting tanks 2S and 3S while tank 1S floods results in a calculated longitudinal free surface correction of 0.83 feet.
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