No person shall land, discharge, load, or takeoff in a helicopter at any place within the City of Mentor except at Lost Nation Airport or at a duly approved heliport or helistop conforming to the requirements of this chapter, provided, however, that the Safety Director may approve the landing or takeoff of a helicopter at a different location and for a period of time specifically approved by him in cases of emergency, public ceremony, or other necessity. The Safety Director may grant a general exemption to this section for helicopters used by an approved emergency service provided said emergency service has an operating policy approved by the Police and Fire Departments. (1969 Code 103.03)