What color indicator should be visible when preflighting the Portable Breathing Equipment (PBE)?

When preflighting the Portable Breathing Equipment (PBE), the correct indicator color that should be visible is green. The green indicator typically signifies that the PBE is in a ready and operational state, meaning that it is fully charged and available for use in an emergency situation. The visibility of this green indicator is crucial for the safety and preparedness of the flight crew, ensuring that all safety equipment is functioning properly before departure.

The other colors, such as red, yellow, or blue, often indicate an issue or a different status that may require maintenance or indicate that the equipment is not ready for use. For instance, a red indicator commonly suggests that the equipment needs immediate attention or is not safe for operation, which could compromise safety during an emergency. Understanding these color indicators is essential for flight attendants to ensure that safety equipment is always ready and reliable when needed.