FAA Powerplant Written Practice Test

What mechanism transports the extinguishing agent to a fire in an engine fire extinguishing system?

1. Gravity

2. Electrical impulses

3. Pressurized gas

4. Mechanical pumps

The correct answer is: Pressurized gas

The correct answer is based on the principle of how fire extinguishing systems disburse their extinguishing agents in aircraft engines. In an engine fire extinguishing system, the extinguishing agent is typically stored in a pressurized container. When activated — either manually or automatically — this pressurized gas propels the extinguishing agent through a network of hoses and nozzles directly to the source of the fire. Pressurized gas systems are effective because they can deliver the extinguishing agent swiftly and efficiently, ensuring that it reaches the burning area before the fire can spread or worsen. This method of using pressurized gas is common in various fire suppression systems due to its reliability and effectiveness. While gravity, electrical impulses, and mechanical pumps can be part of other systems in different contexts, they do not play the primary role in the transportation of extinguishing agents in the cockpit and engine fire suppression systems where immediacy and effectiveness are crucial.