What type of pressure does a technician apply during the static system check to assess for leaks?

In a static system check, a technician applies static pressure to ensure the integrity of the aircraft's static pressure system. This process involves isolating the static system and applying pressure to it; the goal is to confirm that the system can maintain the pressure without any leaks.

While it may seem logical to consider negative pressure, in this context, the technician is focused on ensuring that the system holds the applied static pressure without a drop, which indicates that the system is sealed properly. If there were leaks, the pressure would decrease, signaling a problem with the static system.

Therefore, during the leak check, the technician is primarily monitoring for the ability of the static system to retain the applied static pressure effectively, rather than working with dynamic pressure or absolute pressure, which relate to different contexts in aviation systems.