General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

What is the purpose of the FIRE/OVHT TEST switch?

1. To activate the engine fire extinguishers only

2. To send test signals to fire detection systems

3. To confirm APU operational status

4. To test cargo compartment pressure

The correct answer is: To send test signals to fire detection systems

The purpose of the FIRE/OVHT TEST switch is to send test signals to fire detection systems. When the switch is activated, it initiates a self-test of the fire detection systems, allowing the crew to confirm that the sensors and alarms are functioning correctly. This is a critical safety feature that ensures any potential fire or overheating conditions can be detected promptly. Regular testing of fire detection systems contributes to the overall safety of the aircraft, ensuring that any malfunctions can be identified and addressed before they lead to more serious issues. This function is essential for operational safety but is distinct from other options. While activation of the FIRE/OVHT TEST switch does not directly engage fire extinguishers or relate to APU status or cargo compartment pressure, it serves a vital role in verifying the integrity of the fire detection and warning systems, which is crucial for maintaining aircraft safety.