How can Emergency Lights be activated?

The activation of emergency lights is an essential safety feature on an aircraft, allowing for visibility during a crisis when regular lighting may fail. The correct answer highlights the ability of the flight deck crew to manually activate these lights. This capability is crucial because it ensures that in a situation where an emergency might disrupt normal functions or power supply, trained crew members can quickly provide illumination for the safe evacuation of passengers or to guide them to exits.

Manually activating the emergency lights gives the flight deck crew control to respond appropriately to varying emergency scenarios, such as smoke, fire, or loss of cabin pressure. They can make this decision based on the specific circumstances at hand, ensuring prompt action to enhance passenger safety.

Other options present considerations that do not accurately reflect the procedures or protocols of emergency light activation. For instance, while the emergency lights will automatically activate in some specific scenarios, it typically does not occur during normal operations, which is why the first option is not correct. Additionally, while cabin pressure changes might trigger other safety systems, they do not activate the emergency lights directly, explaining why the third option is also not correct. Passengers are not trained to handle such systems, thus the idea that they could activate emergency lights manually is not aligned with standard protocols for flight safety