On which side of the aircraft are the O2 bottles primarily stored?

Oxygen (O2) bottles are primarily stored on the right side of an aircraft for several practical reasons related to balance, accessibility, and safety. Aircraft design emphasizes weight distribution to maintain stability during flight; positioning the oxygen bottles on the right side helps achieve this balance, particularly in single-engine or smaller aircraft.

Moreover, having the oxygen storage on the right side can streamline access for crew members, ensuring that life-support equipment is readily available in emergencies. In many aircraft, the right side of the cockpit is designed to accommodate equipment used during emergency situations, including oxygen systems for pilots and passengers in depressurized environments. This design consideration also aids in compliance with safety regulations, allowing for efficient operation during emergency procedures.

In contrast, the other storage locations mentioned, such as the center of the aircraft or underneath the seats, may not be practical due to spatial constraints, or they may create complications related to weight distribution and quick access during emergencies. Thus, the choice to store oxygen bottles on the right side aligns with both operational efficiency and safety standards.