14 C.F.R. § 93.311 Minimum terrain clearance.
Title 14 - Aeronautics and Space
Except in an emergency, when necessary for takeoff or landing, or unless otherwise authorized by the Flight Standards District 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.
Title 14: Aeronautics and Space
PART 93—SPECIAL AIR TRAFFIC RULES
Subpart U—Special Flight Rules in the Vicinity of Grand Canyon National Park, AZ
§ 93.311 Minimum terrain clearance.
