Which system helps improve engine control and complies with environmental regulations?

The option that best aligns with improving engine control and complying with environmental regulations is the bleed air systems. These systems enhance engine efficiency by managing airflow within the engine, allowing for optimal performance under varying conditions.

Bleed air systems are responsible for extracting compressed air from the engine, usually from the high-pressure compressor. This air can be utilized for various functions, such as engine starting, cabin pressurization, and enhancing thrust at certain operational phases like takeoff. By optimizing the amount of air mixed with fuel during combustion, manufacturers can achieve lower emissions, helping to meet stringent environmental standards.

Additionally, controlling the bleed air effectively allows for better management of engine performance and stability, especially during different flight phases, leading to improved engine control. This not only enhances operational efficiency but also minimizes environmental impact by ensuring that the engine burns fuel more cleanly.