No real property for which a specific variance has been granted by the Board under Subtitle 8 of this title, or that is encumbered by an avigation easement granted to the Administration, may be selected for participation in the pilot program established by § 5-1204 of this subtitle. The Board may not grant any variance under Subtitle 8 of this title from noise zone regulations for any proposed residential or educational use of real property during the period that the pilot program established by § 5-1204 of this subtitle is in operation.