Subject to the provisions of Section 1k of this Act, machinery and equipment used in the operation of an aircraft maintenance facility as defined in Section 1k, located within an enterprise zone shall be exempt from the tax imposed by this Act

Sec. 1m. Subject to the provisions of Section 1k of this Act, machinery and equipment used in the operation of an aircraft maintenance facility as defined in Section 1k, located within an enterprise zone shall be exempt from the tax imposed by this Act. The machinery and equipment exempted by this Section is limited to machinery and equipment used primarily to maintain, rebuild or repair aircraft used as rolling stock moving in interstate commerce for hire by the operator of the facility. The Department of Revenue shall promulgate any rules and regulations necessary to further define machinery and equipment eligible for exemption in an aircraft maintenance facility. (Source: P.A. 86-1490.)