What is the purpose of the PBE in an aircraft?

The purpose of the Portable Breathing Equipment (PBE) in an aircraft is to supply oxygen in emergencies. This device is specifically designed to protect crew members and passengers from smoke, toxic fumes, or other hazardous atmospheric conditions that may arise during in-flight emergencies. The PBE typically provides a source of breathable air and helps ensure that individuals can continue to function and aid in evacuating or managing the situation effectively.

The equipment is critical during scenarios such as fire outbreaks, where smoke can compromise air quality, making it difficult or impossible to breathe. By offering a reliable means of oxygen, the PBE enables the crew to execute emergency procedures while maintaining their physical capacity and protecting their health.

Other options do not pertain to the primary function of the PBE itself. For instance, while providing information about the flight, assisting during passenger boarding, or storing medical supplies plays important roles in overall aircraft safety and operations, they fall outside the specific purpose of the PBE.