How does a vacuum system operate in an aircraft?

A vacuum system in an aircraft operates by creating negative pressure relative to the surrounding atmosphere. This negative pressure can be utilized to power various instruments, such as gyroscopic instruments that provide critical flight information.

In a vacuum system, air is removed from a sealed chamber, which reduces the air pressure inside that chamber compared to the outside atmosphere. This difference in pressure is what causes the system to function efficiently, allowing instruments to operate correctly and provide accurate readings to the pilot.

The other options do not accurately describe the function of a vacuum system. For instance, systems that create positive pressure typically manage cabin air circulation or pressurization, while the operation of landing gear is generally managed by hydraulic systems rather than a vacuum system. Thus, understanding that the vacuum system's primary role is to establish a negative pressure environment helps clarify its importance in supporting various critical flight instruments.