Except in an emergency, when necessary for takeoff or landing, or unless otherwise authorized by the responsible Flight Standards Office for a purpose listed in §93.309(c), no person may operate an aircraft within 500 feet of any terrain or structure located between the north and south rims of the Grand Canyon.

[Docket No. FAA-2018-0851, Amdt. 93-102, 83 FR 48212, Sept. 24, 2018]