An aircraft is involved in an emergency if:
(a) the aircraft is being used for or in connection with:
(i) a search and rescue operation; or
(ii) a medical emergency; or
(iii) a natural disaster; or
(b) the pilot of the aircraft has declared an in - flight emergency; or
(c) the aircraft has insufficient fuel to be diverted to another airport; or
(d) there is an urgent need for the aircraft to land or take off:
(i) to ensure the safety or security of the aircraft or any person; or
(ii) to avoid damage to property.