The COASTAL DRILLER, when underway was loaded as shown in Sample Load Form #1 (Rig Move). It is now preloaded at minimum air gap waiting for all settling to take place. The preload, weighing 7,191.7 kips, has LM 870,196 ft-kips and TM 2,158 ft-kips. What is the starboard leg reaction?

Correct Answer: Option D — 7,180 kips

Leg reaction forces during preloading are calculated using static equilibrium equations involving total weight, longitudinal moments, and transverse moments about the support points. Applying the given load data for the COASTAL DRILLER results in a starboard leg reaction of 7,180 kips.