The Gas Turbine Engine (GTE) is directly coupled to what component?

The Gas Turbine Engine (GTE) is directly coupled to what component?

• A. Low Speed (LS) pinion shaft
• B. High Speed (HS) pinion shaft
• C. Main crankshaft
• D. Starter motor

Answer: (B)

In a gas turbine, the rotating core is the high-speed spool, and there isn’t a piston-style crankshaft. The starter motor turns a small gear that meshes with the high-speed pinion shaft, which is directly connected to the high-speed spool. This single direct drive is what gets the compressor/turbine assembly spinning from a standstill and brings the engine up to speed. Once running, the high-speed shaft also drives the accessory gearbox to power pumps and generators. The other options either describe parts that aren’t the direct interface for starting the core, or refer to the device (starter) rather than the shaft itself.

In a gas turbine, the rotating core is the high-speed spool, and there isn’t a piston-style crankshaft. The starter motor turns a small gear that meshes with the high-speed pinion shaft, which is directly connected to the high-speed spool. This single direct drive is what gets the compressor/turbine assembly spinning from a standstill and brings the engine up to speed. Once running, the high-speed shaft also drives the accessory gearbox to power pumps and generators. The other options either describe parts that aren’t the direct interface for starting the core, or refer to the device (starter) rather than the shaft itself.