A ring seal assembly for a gas turbine engine shaft, comprising: a front seat coupled to a rear seat ; an air side ring seal having a first forward axially outer surface(116-1) opposite a first aft axially outer surface (116-2), wherein the first forward axially outer surface is configured to be in contact with the front seat; and an oil side ring seal having a second forward axially outer surface (126-1) opposite a second aft axially outer surface (126-2), wherein the second aft axially outer surface is configured to be in contact with the rear seat, and wherein the oil side ring seal comprises an extended leg protruding in an axial direction (A) from the second forward axially outer surface towards the first aft axially outer surface of the air side ring seal, wherein the extended leg and the second forward axially outer surface of the oil side ring seal and the first aft axially outer surface of the air side ring seal define a spring cavity ; wherein the air side ring seal comprises: a first forward axial surface groove (117-1) defining a radial groove on the first forward axially outer surface; and characterized in that the air side ring seal further comprises: a first radial surface groove defining an axial groove on a first radially outer surface ; and a first aft axial surface groove (117-2) defining a radial groove on the first aft axially outer surface; wherein the first forward axial surface groove is aligned with the first radial surface groove; wherein the first aft axial surface groove is aligned with the first radial surface groove. a front seat coupled to a rear seat ; an air side ring seal having a first forward axially outer surface(116-1) opposite a first aft axially outer surface (116-2), wherein the first forward axially outer surface is configured to be in contact with the front seat; and an oil side ring seal having a second forward axially outer surface (126-1) opposite a second aft axially outer surface (126-2), wherein the second aft axially outer surface is configured to be in contact with the rear seat, and wherein the oil side ring seal comprises an extended leg protruding in an axial direction (A) from the second forward axially outer surface towards the first aft axially outer surface of the air side ring seal, wherein the extended leg and the second forward axially outer surface of the oil side ring seal and the first aft axially outer surface of the air side ring seal define a spring cavity ; wherein the air side ring seal comprises: a first forward axial surface groove (117-1) defining a radial groove on the first forward axially outer surface; and characterized in that the air side ring seal further comprises: a first radial surface groove defining an axial groove on a first radially outer surface ; and a first aft axial surface groove (117-2) defining a radial groove on the first aft axially outer surface; a first forward axial surface groove (117-1) defining a radial groove on the first forward axially outer surface; and characterized in that the air side ring seal further comprises: a first radial surface groove defining an axial groove on a first radially outer surface ; and a first aft axial surface groove (117-2) defining a radial groove on the first aft axially outer surface; a first radial surface groove defining an axial groove on a first radially outer surface ; and a first aft axial surface groove (117-2) defining a radial groove on the first aft axially outer surface; wherein the first forward axial surface groove is aligned with the first radial surface groove; wherein the first aft axial surface groove is aligned with the first radial surface groove. <EOS>