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

What happens when the cargo fire arm switch is activated?

1. Only the selected compartment valve is armed

2. All cargo fire extinguishers are armed

3. Commands packs for normal airflow

4. Turns off both packs

The correct answer is: All cargo fire extinguishers are armed

When the cargo fire arm switch is activated, it arms all cargo fire extinguishers. This process is crucial for ensuring the safety of the aircraft by preparing all available extinguishing systems to respond effectively in the event of a fire detected in any of the cargo compartments. Each cargo compartment is equipped with fire extinguishers that can be activated to suppress flames and prevent the spread of fire, helping to mitigate risks to the aircraft and its occupants. Other choices do not accurately reflect the function of the cargo fire arm switch. For instance, while the selected compartment valve may be involved in specific procedures when dealing with cargo fires, it does not encompass the full extent of the fire suppression system's readiness that comes with arming all extinguishers. Similarly, activating the fire arm switch does not control airflow or turn off packs; those actions relate to different operational protocols regarding cabin pressurization and airflow management in specific emergency situations. Therefore, the correct answer emphasizes the comprehensive activation and readiness of the fire suppression systems across all cargo compartments.