Which of the following best describes how the starter system contributes to the engine's operation?

The starter system's primary function in the operation of a gas turbine engine is to spin the rotor to initiate combustion. This process is essential for starting the engine, as the rotor needs to reach a certain speed to allow for the necessary air and fuel mixture to ignite. When the starter system engages, it typically drives the engine's compressor, which pressurizes the air and helps create the conditions needed for combustion.

Once the rotor is sufficiently spun, the engine can begin its ignition phase, leading to a self-sustaining combustion process. This makes the starter system a crucial component for the initial phase of engine operation, enabling the transition from a non-operational state to full engine function.