Which of the following operational practices is helpful in avoiding the accumulation of condensate in the main reduction gear casing?

Correct Answer: Option A — After the main unit is secured, lubricating oil should be circulated until the temperature of the oil and reduction gear casing approximates the engine room temperature.

Circulating lubricating oil after securing prevents temperature differentials that condense ambient moisture inside the gear casing. Maintaining oil circulation until casing temperatures match ambient engine room conditions eliminates water contamination, preserving lube oil integrity and protecting gear teeth from corrosion.