What component helps prevent excessive turbine temperatures at low speeds?

The starter motor plays a key role during the initial stages of engine operation, particularly at low speeds. When an aircraft's engine is starting up, it requires an adequate supply of airflow and fuel to maintain the correct combustion temperatures. At low speeds, the engine may not produce enough airflow to effectively cool the turbine components, which can lead to excessive temperatures.

The starter motor provides the necessary rotational energy to start the engine and bring it up to the required speed, allowing the centrifugal compressor to generate adequate airflow through the engine. This increase in airflow helps cool the turbine components effectively, preventing overheating. Thus, the starter motor is critical in ensuring that the engine can reach operational speeds where the airflow is sufficient to maintain safe temperature levels.

In contrast, other components, such as the oil pump assembly, are responsible for lubrication and do not directly address temperature control at low speeds. The centrifugal compressor is more involved in compressing air for the combustion process, while the centrifugal speed switch monitors the engine's operational parameters rather than actively managing temperatures.