Commercial Pilot License (CPL) 2025 – 400 Free Practice Questions to Pass the Exam

The cabin air safety valve is the correct device that regulates cabin pressure by preventing it from exceeding a specified limit during flight. This valve is critical for maintaining a safe and comfortable environment for passengers and crew, especially at high altitudes where external pressure is significantly lower.

When the aircraft climbs, the cabin pressure increases due to the pressurization system, and the safety valve allows excess pressure to escape if it reaches a predetermined level. This prevents structural damage to the aircraft and ensures that the internal pressure remains within safe operational limits.

The cabin pressure regulator could also play a role in managing cabin pressure; however, its primary function is to control the pressure level, rather than acting as a fail-safe to prevent over-pressurization. A cockpit control valve pertains to managing airflow within the cockpit but does not address cabin pressure directly. The cockpit pressure gauge merely measures cabin pressure without any regulatory control functions.

Given these roles, the cabin air safety valve effectively serves as the safeguard against excess cabin pressure, making it the right answer.