(1) Unless necessary to maintain a safe distance from other aircraft or terrain --

(i) Remain clear of the areas described in Section 4; and

(ii) Remain at or above the following altitudes in each sector of the canyon:

Eastern section from Lees Ferry to North Canyon and North Canyon to Boundary Ridge: as prescribed in Section 5.

Boundary Ridge to Supai Point (Yumtheska Point): 10,000 feet MSL.

Western section from Diamond Creek to the Grant Wash Cliffs: 8,000 feet MSL.

11,500 or

>10,500 or

>12,500 feet MSL

(b) Is authorized in writing by the Flight Standards District Office and is conducted in compliance with the conditions contained in that authorization. Normally authorization will be granted for operation in the areas described in Section 4 or below the altitudes listed in Section 5 only for operations of aircraft necessary for law enforcement, firefighting, emergency medical treatment/evacuation of persons in the vicinity of the Park; for support of Park maintenance or activities; or for aerial access to and maintenance of other property located within the Special Flight Rules Area. Authorization may be issued on a continuing basis. (c)(1) Prior to November 1, 1988, is conducted in accordance with a specific authorization to operate in that airspace incorporated in the operator's part 135 operations specifications in accordance with the provisions of SFAR 50-1, notwithstanding the provisions of Sections 4 and 5; and

(2) On or after November 1, 1988, is conducted in accordance with a specific authorization to operate in that airspace incorporated in the operated in the operator's operations specifications and approved by the Flight Standards District Office in accordance with the provisions of SFAR 50-2.

(d) Is a search and rescue mission directed by the U.S. Air Force Rescue Coordination Center.

(e) Is conducted within 3 nautical miles of Whitmore Airstrip, Pearce Ferry Airstrip, North Rim Airstrip, Cliff Dwellers Airstrip, or Marble Canyon Airstrip at an altitudes less than 3,000 feet above airport elevation, for the purpose of landing at or taking off from that facility. Or

(f) Is conducted under an IFR clearance and the pilot is acting in accordance with ATC instructions. An IFR flight plan may not be filed on a route or at an altitude that would require operation in an area described in Section 4.

Section 4. Flight-free zones. Except in an emergency or if otherwise necessary for safety of flight, or unless otherwise authorized by the Flight Standards District Office for a purpose listed in Section 3(b), no person may operate an aircraft in the Special Flight Rules Area within the following areas:

(a) Desert View Flight-Free Zone. Within an area bounded by a line beginning at Lat. 35°59&min;30&sec; N., Long. 111°46&min;20&sec; W. to 35°59&min;30&sec; N., Long. 111°52&min;45&sec; W.; to Lat. 36°04&min;50&sec; N., Long. 111°52&min;00&sec; W.; to Lat. 36°06&min;00&sec; N., Long. 111°46&min;20&sec; W.; to the point of origin; but not including the airspace at and above 10,500 feet MSL within 1 mile of the western boundary of the zone. The area between the Desert View and Bright Angel Flight-Free Zones is designated the "Zuni Point Corridor."

(b) Bright Angel Flight-Free Zone. Within an area bounded by a line beginning at Lat. 35°59&min;30&sec; N., Long. 111°55&min;30&sec; W.; to Lat. 35°59&min;30&sec; N., Long. 112°04&min;00&sec; W.; thence counterclockwise via the 5 statute mile radius of the Grand Canyon Airport point (Lat. 35°57&min;09&sec; N., Long. 112°08&min;47&sec; W.) to Lat. 36°01&min;30&sec; N., Long. 112°11&min;00&sec; W.; to Lat. 36°06&min;15&sec; N., Long. 112°12&min;50&sec; W.; to Lat. 36°14&min;40&sec; N., Long. 112°08&min;50&sec; W.; to Lat. 36°14&min;40&sec; N., Long. 111°57&min;30&sec; W.; to Lat. 36°12&min;30&sec; N., Long. 111°53&min;50&sec; W.; to the point of origin; but not including the airspace at and above 10,500 feet MSL within 1 mile of the eastern boundary between the southern boundary and Lat. 36°04&min;50&sec; N. or the airspace at and above 10,500 feet MSL within 2 miles of the northwest boundary. The area bounded by the Bright Angel and Shinumo Flight-Free Zones is designated the "Dragon Corridor."

(c) Shinumo Flight-Free Zone. Within an area bounded by a line beginning at Lat. 36°04&min;00&sec; N., Long. 112°16&min;40&sec; W.; northwest along the park boundary to a point at Lat. 36°12&min;47&sec; N., Long. 112°30&min;53&sec; W.; to Lat. 36°21&min;15&sec; N., Long. 112°20&min;20&sec; W.; east along the park boundary to Lat. 36°21&min;15&sec; N., Long. 112°13&min;55&sec; W.; to Lat. 36°14&min;40&sec; N., Long. 112°11&min;25&sec; W.; to the point of origin. The area between the Thunder River/Toroweap and Shinumo Flight Free Zones is designated the "Fossil Canyon Corridor."

(d) Toroweap/Thunder River Flight-Free Zone. Within an area bounded by a line beginning at Lat. 36°22&min;45&sec; N., Long. 112°20&min;35&sec; W.; thence northwest along the boundary of the Grand Canyon National Park to Lat. 36°17&min;48&sec; N., Long. 113°03&min;15&sec; W.; to Lat. 36°15&min;00&sec; N., Long. 113°07&min;10&sec; W.; to Lat. 36°10&min;30&sec; N., Long. 113°07&min;10&sec; W.; thence east along the Colorado River to the confluence of Havasu Canyon (Lat. 36°18&min;40&sec; N., Long. 112°45&min;45&sec; W.;) including that area within a 1.5 nautical mile radius of Toroweap Overlook (Lat. 36°12&min;45&sec; N., Long. 113°03&min;30&sec; W.); to the point of origin; but not including the following airspace designated as the "Tuckup Corridor": at or above 10,500 feet MSL within 2 nautical miles either side of a line extending between Lat. 36°24&min;47&sec; N., Long. 112°48&min;50&sec; W. and Lat. 36°17&min;10&sec; N., Long. 112°48&min;50&sec; W.; to the point of origin.

Section 5. Minimum flight altitudes. Except in an emergency or if otherwise necessary for safety of flight, or unless otherwise authorized by the Flight Standards District Office for a purpose listed in Section 3(b), no person may operate an aircraft in the Special Flight Rules Area at an altitude lower than the following:

(a) Eastern section from Lees Ferry to North Canyon: 5,000 feet MSL.

(b) Eastern section from North Canyon to Boundary Ridge: 6,000 feet MSL.

(c) Boundary Ridge to Supai (Yumtheska) Point: 7,500 feet MSL.

(d) Supai Point to Diamond Creek: 6,500 feet MSL.

(e) Western section from Diamond Creek to the Grand Wash Cliffs: 5,000 feet MSL.

[66 FR 1003, Jan. 4, 2001, as amended at 66 FR 16584, Mar. 26, 2001]