Ring gear mounting arrangement with oil scavenge scheme

A gas turbine engine comprising:

• a fan section including a turbo fan supported on a turbo fan shaft;
• a turbine section including a turbine shaft;
• a compressor section having compressor hubs with blades driven by the turbine shaft about an axis;
• and
• an epicyclic gear train interconnecting the turbo fan shaft and the turbine shaft, the epicyclic gear train comprising:
• a sun gear coupled to the turbine shaft such that the sun gear is rotatable about the axis;
• intermediary gears arranged circumferentially about and meshing with the sun gear;
• a carrier supporting the intermediary gears;
• and
• a ring gear including first and second portions each having an inner periphery with teeth, the first and second portions arranged about and intermeshing with the intermediate gears, the first and second portions abutting one another at a radial interface, the first and second portions including respective flanges extending along the radial interface radially outward from the teeth, and wherein the teeth of the first and second portions are oppositely angled teeth that force the first and second portions toward one another at the radial interface in operation.