Ritual Masses are connected to the celebration of certain Sacraments or Sacramentals. They are prohibited on Sundays of Advent, Lent, and Easter, on Solemnities, on the days within the Octave of Easter, on the Commemoration of All the Faithful Departed (All Souls’ Day), on Ash Wednesday, and during Holy Week, and furthermore due regard is to be had for the norms set out in the ritual books or in the Masses themselves.
There's nothing there to prohibit the use of a Ritual Mass on a Sunday in Ordinary Time.
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