What are pneumatic systems commonly used for in aircraft?

Pneumatic systems are commonly utilized in aircraft for various functions that require the application of compressed air or gas. The primary uses include operating brakes, actuation of doors, engine starting mechanisms, and deploying emergency devices.

The operating principle of these systems revolves around the use of pressurized air to create motion and perform tasks, which is particularly important in the confined space and weight-sensitive environment of an aircraft. For instance, pneumatic braking systems allow for efficient braking with minimal additional weight, while pneumatic doors can operate swiftly and reliably in-flight. The ability to use pneumatic systems for engine starting, especially in turbine engines, is also crucial for the initial ignition process.

Other options mentioned, like operating satellite communications, handling graphic displays, or generating electrical power, do not typically rely on pneumatic systems. These functions are generally managed through electronic systems, hydraulic systems, or dedicated electrical circuits, thus highlighting the specialized role that pneumatic systems play in aircraft operation.