Cmc airfoil with cooling passage having multi-dimensional plenum

An airfoil comprising:

• an airfoil section defining pressure and suction sides, a leading edge, and a trailing edge region including a trailing edge, the leading edge and the trailing edge defining a chordal direction therebetween, the airfoil section being formed of a ceramic matrix composite that includes fiber plies disposed in a ceramic matrix, the fiber plies including:
• a group of core fiber plies defining a radial tube that circumscribes an internal cavity, and
• a group of skin fiber plies defining an exterior of the airfoil section and wrapping around the group of core fiber plies from the pressure side of the trailing edge region, through the leading edge, and to the suction side of the trailing edge region;
• a filler element in the trailing edge region aft of the internal cavity and sandwiched between the group of skin fiber plies on the pressure side and the group of skin fiber plies on the suction side;
• and
• at least one cooling passage including:
• at least one inlet orifice section opening to the internal cavity and extending through the group of core fiber plies,
• a radially-elongated serpentine plenum connected with the at least one inlet orifice section, the radially-elongated serpentine plenum winding chordally through the fiber plies,
• a plurality of outlet orifice sections extending through the trailing edge, and
• a plurality of intermediate passage sections bound by at least one of the skin fiber plies and the filler element and connecting the radially-elongated serpentine plenum with the plurality of outlet orifice sections.