Notwithstanding any other provision of this article, the following categories of aircraft are exempt from the provisions of this article:
A. Aircraft operated by or for the United States of America or the state of California.
B. Law enforcement, emergency, fire or rescue aircraft operated by or for any county or city of the state of California.
C. Aircraft used for emergency purposes during an emergency officially proclaimed by competent authority pursuant to the laws of the United States, the state of California, or the city or county of Sacramento.
D. Aircraft engaged in take-offs or landings while conducting tests under direction of the airport director in an attempt to determine the aircraft noise level pursuant to the provisions of this article.
E. Aircraft involved in a bona fide emergency which requires a landing for the preservation of life or property. (Prior code § 4.04.108)