PSA Airlines Canadair Regional Jet Systems (PSA-CRJ) Practice Exam

What happens when the Engine Fire Push switch is activated?

1. Only fuel shutoff valves close

2. All Fire Twice extinguishers are discharged

3. The generator trips and the fuel SOV closes

4. The fire detection system resets

The correct answer is: The generator trips and the fuel SOV closes

When the Engine Fire Push switch is activated, it initiates a series of critical safety measures designed to deal with an engine fire situation. Activating this switch leads to the closure of the fuel shutoff valves (SOV) and the disconnection of the generator associated with the affected engine. The fuel shutoff valves are crucial because they stop the fuel flow to the engine, which is essential in eliminating the fuel source that could potentially feed the fire. In addition, the generator tripping is a safety measure that helps prevent further electrical complications or hazards. By disconnecting the electrical supply from the engine during a fire event, the risk of an electrical fire or explosion is minimized. The other options do not accurately reflect the immediate actions triggered by the Engine Fire Push switch. For example, the discharge of fire extinguishers, while important in a fire situation, is not the initial reaction prompted by the Engine Fire Push switch. Instead, this action may follow after the switch has been used to isolate the fuel and electrical systems. Therefore, the correct understanding of the switch's activation process and its relationship to engine fire management confirms that the response includes both the closure of fuel SOV and the tripping of the generator.