(a) Aircraft used to transport injured persons, evacuees, medical personnel or public officials in the event of an accident, disaster or emergency;

(b) Aircraft may be landed in City parks when emergency circumstances prevent landing at other safe locations; provided, that the owner submits a written statement explaining the circumstances of the emergency to the Parks and Recreation Director within 72 hours following the emergency landing;

(c) During a City-sponsored event or with an approved special event permit.