During maintenance on oxygen converter assemblies, what should be done if the system is open to the atmosphere?

The correct answer is centered around the need for safety and system integrity when dealing with oxygen converter assemblies. When the system is open to the atmosphere, conducting purging procedures is essential. This is because exposure to atmospheric conditions can introduce contaminants into the oxygen system.

Purging helps to remove any unwanted gases, moisture, or particulate matter that may have entered during maintenance. Oxygen systems are particularly sensitive, as contaminants can pose serious safety risks, including the potential for combustion or degradation of the system's components. By purging the system, you ensure that it operates safely and effectively once reassembled.

Taking actions like performing a full inspection or reassembling immediately without purging could compromise the system’s integrity. Simply closing the system without any action does not address the risks posed by contamination. Therefore, purging is the necessary step to ensure the oxygen converter assembly operates safely and according to standards.