91.06.32 (1) Except when necessary for taking off or landing, or except with
prior written approval of the Commissioner, no aircraft –
(a) shall be flown over built-up areas or over an open-air assembly of persons
at a height less than 1 000 feet above the highest obstacle, within a
radius of 2 000 feet from the aircraft;
(b) when flown elsewhere than specified in paragraph (a), shall be flown at
a height less than 500 feet above the ground or water, unless the flight
can be made without hazard or nuisance to persons or property on the
ground or water; and
(c) shall circle over or do repeated overflights over an open-air assembly
