Tenn. Code Ann. § 8-36-917

Except as otherwise provided in part 8 of this chapter, any retired participant who returns to service in a position covered by the retirement system shall have such participant's retirement allowance under the defined benefit component of the plan suspended while so employed. The participant shall be subject to §§ 8-36-801 — 8-36-804; provided, however, that reemployment in a covered position shall have no effect on a payment under the defined contribution component of the plan.