Tenn. Code Ann. § 68-140-307: Standards for vehicles and equipment.

(a) Standards for the design, construction, equipment, sanitation, operation and maintenance of ambulances, invalid vehicles, and for the operations and minimum emergency care equipment for emergency response vehicles shall be promulgated by the board, including, but not limited to, restrictions on the amount of mileage of an operational vehicle and mandatory mechanical inspections for vehicles over a certain mileage. The board may authorize standards for the licensure of air ambulance services to provide for such special personnel equipment operation and activities as may be necessary. Permits shall not be required for individual aircraft. The board shall promulgate rules and regulations to require the inspection of air ambulance medical equipment and supplies and to require the issuance of a healthcare inspection verification sticker.

(b) Services performed by fixed wing air ambulance organizations that are provided without compensation pursuant to § 68-140-317(a)(2) shall be conducted under part 91 of the federal air regulations. Pilots of such aircraft shall possess a commercial certificate with instrument rating.