Double seal element seal assembly for aircraft system

A system for an aircraft, comprising:

• a first rotating structure rotatable about an axis;
• a second rotating structure rotatable about the axis, the second rotating structure secured to the first rotating structure;
• a stationary structure axially overlapping the first rotating structure and the second rotating structure;
• a first seal element fixed to the stationary structure and sealingly engaging the first rotating structure;
• and
• a second seal element fixed to the stationary structure and sealingly engaging the first rotating structure, the second seal element axially next to the first seal element;
• wherein a cavity is formed by and extends axially between the first seal element and the second seal element, the cavity is formed by and radially adjacent the first rotating structure, and the stationary structure comprises a drain passage fluidly coupled to the cavity,
• wherein the second rotating structure is secured to the first rotating structure at an interface between the first rotating structure and the second rotating structure, and
• wherein the first seal element or the second seal element is axially aligned with the interface between the first rotating structure and the second rotating structure.