Which system is least complicated and used for emergency oxygen supply in pressurized aircraft?

The choice of a chemical oxygen generator system as the least complicated option for emergency oxygen supply in pressurized aircraft is grounded in its straightforward mechanism and safety features. Chemical oxygen generators work by initiating a chemical reaction that produces oxygen, which means they do not require complex storage tanks or high-pressure systems. This simplicity lends itself well to an emergency scenario where quick access and reliability are critical.

Chemical oxygen systems are compact and often have minimal maintenance requirements, making them practical for use in operational environments where space and weight are limited. They also activate automatically or can be manually triggered, ensuring immediate availability when needed. This reliability is essential for emergency breathing situations, where technical failure could have dire consequences.

In contrast, other systems such as compressed gas systems can involve significant complexity due to the need for high-pressure cylinders and regulatory concerns regarding handling and storage. Liquid oxygen systems require additional infrastructure for storage and handling, including thermal insulation to keep the oxygen in a liquid state, which complicates their use. Mixed gas systems further introduce complexity by requiring specific gas mixtures and conditioning, which can complicate use in emergency situations.

Thus, the inherent simplicity, reliability, and safety of chemical oxygen generator systems make them the preferred choice in the context of emergency oxygen supply for pressurized aircraft.