As shown in the illustration, the Synchro-Self-Shifting (SSS) clutch used on the marine gas turbine gears, requires which of the following inputs or conditions to make engagement possible? See illustration GT-0018

Correct Answer: Option B — PT input shaft speed greater than that of the first reduction pinion.

The SSS clutch operates on the principle of overrunning; it engages automatically only when the input shaft (Power Turbine) speed exceeds the output shaft (reduction gear) speed. This allows for seamless power transmission and prevents the turbine from being driven by the propeller during specific maneuvering or shutdown conditions.