While a vessel is underway the low pressure turbine high-speed pinion is damaged. The pinion is then removed from the gear train. Under these circumstances, the main unit is capable of which speed and direction?

Correct Answer: Option A — Reduced speed ahead only

Removing the low-speed pinion or high-speed pinion for the low pressure turbine isolates that turbine path. Because astern elements are typically incorporated within the low-pressure turbine casing, astern operation is lost, leaving only reduced speed ahead powered by the high-pressure turbine.