Bearing compartment oil auto-ignition mitigation

A gas turbine engine comprising:

• a fan section including a plurality of fan blades;
• a compressor section;
• a turbine section driving the fan section or the compressor section through a rotatable shaft that extends along an engine longitudinal axis;
• and
• a bearing assembly comprising:
• a bearing housing extending along the engine longitudinal axis to define a bearing compartment;
• a bearing in the bearing compartment that supports the shaft;
• a lubricant seal assembly adjacent to the bearing housing to bound the bearing compartment along the shaft;
• an air seal assembly defining a vent cavity along the bearing housing, wherein a mixing cavity is defined between the lubricant seal assembly and the air seal assembly;
• and
• wherein the bearing housing defines an airflow supply passage, an airflow vent passage and a scupper passage having respective fluid ports at different circumferential positions relative to the engine longitudinal axis, the fluid port of the airflow vent passage is fluidly coupled to the vent cavity, and the fluid ports of the airflow supply and the scupper passages are fluidly coupled to the mixing cavity.