Aviation Computer Based Training (CBT) 2025 – 400 Free Practice Questions to Pass the Exam

The correct choice ensures that the switch cover is closed and the safety pin is in place. This is crucial because the deployment system of a FEDS (Fire Extinguisher Discharge System) is designed to prevent accidental discharge. The safety pin acts as a physical barrier that prevents the activation of the system, while the closed switch cover provides an additional layer of security against unintended deployment. When both these conditions are met, it significantly reduces the risk of deploying the fire extinguishing system inadvertently, which could be dangerous in an aircraft scenario.

Other options, although they may seem relevant, do not directly contribute to the prevention of deployment in the same concrete manner. For example, turning an initiator handle to unlock might be part of activation rather than prevention, and turning on a cup timer or notifying crew members, while important for operational procedures, does not specifically address the mechanical safety measures necessary to control FEDS deployment.