What effect does the cam control valve have on the brakes during arrestment of an aircraft?

What effect does the cam control valve have on the brakes during arrestment of an aircraft?

• A. Allows hydraulic fluid to bypass the brakes
• B. Opens the system to atmosphere
• C. Restricts hydraulic fluid flow increasing pressure
• D. Decreases brake hydraulic pressure

Answer: (C)

The cam control valve is used to manage hydraulic pressure to the brakes when arrestment occurs. During arrestment, it constricts the flow of hydraulic fluid, trapping pressure in the brake lines so the brakes are applied with the necessary force to absorb the arresting energy. By restricting flow, the system quickly builds brake line pressure rather than letting it bleed off. If the valve allowed fluid to bypass the brakes, if the system opened to atmosphere, or if it reduced pressure, the brakes wouldn’t develop the required force.

The cam control valve is used to manage hydraulic pressure to the brakes when arrestment occurs. During arrestment, it constricts the flow of hydraulic fluid, trapping pressure in the brake lines so the brakes are applied with the necessary force to absorb the arresting energy. By restricting flow, the system quickly builds brake line pressure rather than letting it bleed off. If the valve allowed fluid to bypass the brakes, if the system opened to atmosphere, or if it reduced pressure, the brakes wouldn’t develop the required force.