Why is monitoring APU operations critical for pilots?

Monitoring APU (Auxiliary Power Unit) operations is critical for pilots primarily to ensure safe and effective APU usage. The APU serves essential functions, such as providing electrical power and bleed air for various aircraft systems when the engines are not running. It is imperative to monitor its operation to avoid potential malfunctions that could compromise safety or lead to operational inefficiencies.

Understanding the APU's performance helps pilots detect any abnormalities, manage its operational limits, and ensure that it operates within the prescribed parameters. This vigilance not only affects the reliability of systems powered by the APU but also ensures compliance with safety protocols and maintenance requirements, ultimately contributing to the overall safety and effectiveness of aircraft operations.