Where is the oxygen converter assembly typically located?

The oxygen converter assembly is typically located in areas with limited weight and space due to the need for efficient use of every part of the aircraft's design. This assembly is crucial for generating oxygen for the crew and passengers, particularly in military aircraft where space and weight are often at a premium. Installing the oxygen converter in a compact location allows for optimal aircraft performance while still fulfilling safety requirements.

In many aircraft designs, the goal is to maximize available space and minimize the overall weight, and this is why the assembly is strategically placed in areas that may not seem obvious at first glance but are practical for functionality and access. Its placement also allows for necessary connections and integration with other systems without impeding the overall design and performance of the aircraft.

The other options suggest locations that are either impractical or not commonly used for such systems. For example, near the cockpit instruments would not provide the necessary space for such equipment, while the cargo hold may not offer the best access or efficiency for oxygen distribution. Similarly, placing it underneath passenger seats could hinder passenger comfort and access in emergencies. Thus, locating the oxygen converter assembly in constrained spaces serves both practicality and design efficiency within aviation operations.