What is the FIRST thing that will happen if both the main and standby lube oil pumps fail on a geared main propulsion turbine operating at full sea speed?

Correct Answer: Option A — Ahead throttle will close.

Main propulsion turbines feature a low lubricating oil pressure trip linked to the throttle control. A sudden loss of lube oil pressure automatically closes the ahead throttle via a hydraulic or pneumatic trip interlock to prevent catastrophic bearing wipe and turbine damage.