What is the maximum number of oxygen blowout discs that can be missing?

The correct response indicates that no oxygen blowout discs can be missing. This is important because oxygen blowout discs are critical safety components designed to prevent excessive pressure buildup in systems containing oxygen. If one or more of these discs are absent, there is an increased risk of failure or hazardous situations arising due to uncontrolled pressure release.

Each disc has a designated role in ensuring that the system can safely vent excess pressure before it reaches a level that could lead to catastrophic failure. Therefore, having none missing is essential for maintaining the integrity and safety of the oxygen system. Ensuring that all blowout discs are present and functioning properly is a key aspect of safety protocols in aviation and other applications where oxygen is used under pressure.