Turbine exhaust duct with stiffeners for aircraft engines

A reverse-flow gas turbine engine, comprising:

• an outer case assembly extending around a central axis and enclosing a core, the core including a compressor section, a combustor, and a turbine section, the turbine section located forward of the combustor and of the compressor section relative to a direction of travel of the reverse-flow gas turbine engine, the outer case assembly including an exhaust case defining openings;
• a turbine exhaust duct (TED) fluidly communicating with the turbine section for receiving combustion gases, the turbine exhaust duct having an inlet conduit extending around the central axis, outlet conduits communicating with the inlet conduit and extending through the openings of the exhaust case, and a central passage located radially inwardly of the inlet conduit;
• and
• stiffeners secured to the TED and located within the central passage at circumferential positions being in register with the outlet conduits, the stiffener extending from the TED radially inwardly toward the central axis.