Which aircraft systems are commonly operated pneumatically?

Pneumatically operated systems leverage compressed air to perform various functions within an aircraft, which effectively takes advantage of the efficiency and power that pressurized air can provide. The most common systems operated by pneumatic means in an aircraft include the landing gear, brakes, and flaps.

Pneumatic systems are preferred for landing gear and braking operations due to their rapid deployment capabilities and effectiveness in providing reliable force without the need for complex hydraulic systems. For example, landing gear can be actuated quickly to ensure a safe and efficient deployment during landing or takeoff, while brakes can apply even pressure effectively through pneumatic means, contributing to smoother operation.

The operation of flaps using pneumatic pressure allows for a faster and more controlled adjustment of wing surfaces to aid in flight maneuverability and performance, particularly during takeoff and landing.

In contrast, fuel injectors and engine starters predominantly rely on different forms of power such as fuel pressure and electrical power, while electrical systems and avionics operate on electrical energy rather than pneumatic. Radio communication systems also function predominantly with electrical signals, highlighting that systems not related to air pressure do not fall into the category of pneumatically operated functions. This distinction underlines why the correct answer focuses on landing gear, brakes, and flaps as