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

Correct Answer: Option B — 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 lube oil until the reduction gear casing and oil temperatures approximate ambient engine room conditions prevents moisture condensation. Warm metallic surfaces cooling down in humid environments will condense water vapor into the oil sump; maintaining circulation and extraction prevents oil contamination.