美国航行情报汇编 AERONAUTICAL INFORMATION PUBLICATION AIP 1(25)

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Class G 1,200 feet or less above the surface (regardless of MSL altitude). Day, except as provided in Section 91.155(b) . . . . . . . . . . Night, except as provided in Section 91.155(b) . . . . . . . . . More than 1,200 feet above the surface but less than 10,000 feet MSL. Day . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Night . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . More than 1,200 feet above the surface and at or above 10,000 feet MSL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1 statute mile 3 statute miles 1 statute mile 3 statute miles 5 statute miles  Clear of clouds 500 feet below 1,000 feet above 2,000 feet horizontal 500 feet below 1,000 feet above 2,000 feet horizontal 500 feet below 1,000 feet above 2,000 feet horizontal 1,000 feet below 1,000 feet above 1 statute mile horizontal 

Chapter 4  Visual Flight Rules 
4.1 and Table 4.1  There is no Class F airspace in the U.S. Basic VFR weather minimums are listed in the table above. 
4.1 a)  Except as otherwise authorized by the appropriate air traffic control unit for special VFR flights within Class B, C, D, or E surface areas, no person may operate an aircraft under VFR when the flight visibility is less, or at a distance from clouds that is less than that prescribed for the corresponding altitude and class of airspace in the table above. 
4.1 b)  Class G Airspace: Notwithstanding the provisions of paragraph a) of this section, the following operations may be conducted in Class G airspace below 1,200 feet above the surface: 1) Helicopter. A helicopter may be operated clear of clouds if operated at a speed that allows the pilot adequate opportunity to see any air traffic or obstruction in time to avoid collision. 2) Airplane. When the visibility is less than 3 statute miles but not less than 1 statute mile during night hours, an airplane may be operated clear of clouds if operated in an airport traffic pattern within one.half mile of the runway. 

4.1 c)  Except as provided in 4.2, no person may operate an aircraft under VFR within the lateral boundaries of the surface areas of Class B, Class C, Class D, or Class E airspace designated for an airport when the ceiling is less than 1,000 feet. 
4.1 d)  Except as provided in 4.2, no person may take.off or land an aircraft, or enter the traffic pattern area of an airport under VFR, within the lateral boundaries of the surface area of Class B, Class C, Class D, or Class E airspace designed for an airport: 1) unless ground visibility at that airport is at least 3 statute miles; or 2) if ground visibility is not reported at that airport, unless flight visibility during landing or takeoff, or while operating in the traffic pattern is at least 3 statute miles. 
4.2  In the U.S., no person may operate an aircraft beneath the ceiling under VFR within the lateral boundaries of controlled airspace designated to the surface for an airport when the ceiling is less than 1,000 feet. No person may take.off or land an aircraft (other than a helicopter) under special VFR (SVFR) unless ground visibility is at least 1 statute mile or if ground visibility is not reported, unless flight visibility is at least 1 statute mile. The U.S. restricts the ceiling to 1,000 ft. and ground visibility of 3 miles and greater. 
4.2 a)  When an appropriate ATC clearance has been received, the special weather minimums in this section apply to the operation of an aircraft in a Class B, C, D, or E surface area under VFR. 1) No person may operate an aircraft in a Class B, C, D, or E surface area under VFR except clear of clouds; 2) No person may operate an aircraft (other than a helicopter) in a Class B, C, D or E surface area under VFR unless flight visibility is at least 1 statute mile; 3) No person may take.off or land an aircraft (other than a helicopter) at any airport in a Class B, C, D or E surface area under VFR: a) unless ground visibility at that airport is at least 1 statute mile; or b) if ground visibility is not reported at that airport, unless flight visibility during landing or take.off is at least 1 statute mile. 
4.3  The U.S. does not prohibit VFR flight between sunset and sunrise. 
4.4  In the U.S., VFR flight is not permitted within Class A airspace designated in 14 CFR Part 71 unless otherwise authorized by ATC. In the U.S., an ATC clearance is needed for VFR flight only in Class B airspace area. The U.S. limits VFR flights up to FL 180. 
4.5  The U.S. limits VFR flights up to FL 180. 
4.6  In addition, anywhere, an altitude allowing, if a power unit fails, an emergency landing without due hazard to persons or property on the surface. 
4.7  In addition, grid tracks are not used to determine cruising altitudes in polar areas. True tracks are used to determine cruising levels above FL 230 in the area north of Alaska bounded by the true North Pole to 72000'00 N, 141000'00 W; to 72000'00 N, 158000'00 W; to 68000'00 N, 168058'23 W; to point of beginning. The U.S. has named this area the Anchorage Arctic CTA/FIR for national reference purposes. 
　
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