What must be monitored alongside cabin differential pressure to ensure safe operation?

Monitoring pneumatic pressure alongside cabin differential pressure is crucial for safe operation in the King Air 350. The cabin differential pressure is indicative of the pressurization system's performance, and pneumatic pressure refers to the pressure used in the aircraft's environmental control systems. These systems work in conjunction to maintain a safe and comfortable cabin environment, especially during altitude changes.

If pneumatic pressure is inadequate, it can directly affect the cabin pressurization system's ability to function correctly, potentially leading to unsafe cabin pressures. Therefore, keeping an eye on both metrics is essential to ensure that the pressurization system operates effectively and that the aircraft remains within its operational safety limits. This relationship is integral to preventing situations such as cabin depressurization or insufficient pneumatic power, which could compromise passenger safety.

In contrast, monitoring fuel flow rate, propeller RPM, and engine temperature, while important for overall aircraft operation, do not have a direct relationship with cabin differential pressure and pneumatic pressure, making them lesser priorities for ensuring cabin safety specifically.