What gear is driven by the turning gear?

The turning gear is specifically designed to rotate the turbine engine at a slow speed for operational checks or to prepare the engine for starting. In this context, the upper outboard second reduction pinion is directly driven by the turning gear. This gear is crucial as it helps in the reduction of speed from the high-speed turbine rotation to a suitable speed for auxiliary components and systems, ensuring that the engine's turbine components are properly lubricated and maintained before ignition.

Understanding this relationship highlights the importance of the turning gear in the overall operation of the gas turbine system. It allows for the correct sequencing of operations in adherence to maintenance protocols and helps ensure the turbine engine is in optimal working condition before it is put under load.