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ClassD, Class E, or Class G airspace;
4. Class D airspace is more restrictive than
ClassE or Class G airspace; and
5. Class E is more restrictive than Class G
airspace.
3-1-4. Basic VFR Weather Minimums
a. No person may operate an aircraft under basic
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.
(See TBL 3-1-1.)
NOTEStudent
pilots must comply with 14 CFR Section 61.89(a)
(6) and (7).
b. Except as provided in 14 CFR Section 91.157,
Special VFR Weather Minimums, 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. (See 14 CFR
Section91.155(c).)
AIM 2/14/08
3-1-2 General
TBL 3-1-1
Basic VFR Weather Minimums
Airspace Flight Visibility Distance from Clouds
Class A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Not Applicable Not Applicable
Class B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 statute miles Clear of Clouds
Class C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 statute miles 500 feet below
1,000 feet above
2,000 feet horizontal
Class D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 statute miles 500 feet below
1,000 feet above
2,000 feet horizontal
Class E
Less than 10,000 feet MSL . . . . . . . . . . . . . . . . . . . . . . . . 3 statute miles 500 feet below
1,000 feet above
2,000 feet horizontal
At or above 10,000 feet MSL . . . . . . . . . . . . . . . . . . . . . . 5 statute miles 1,000 feet below
1,000 feet above
1 statute mile horizontal
Class G
1,200 feet or less above the surface (regardless of MSL
altitude).
Day, except as provided in section 91.155(b) . . . . . . . . . . 1 statute mile Clear of clouds
Night, except as provided in section 91.155(b) . . . . . . . . . 3 statute miles 500 feet below
1,000 feet above
2,000 feet horizontal
More than 1,200 feet above the surface but less than
10,000 feet MSL.
Day . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 statute mile 500 feet below
1,000 feet above
2,000 feet horizontal
Night . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 statute miles 500 feet below
1,000 feet above
2,000 feet horizontal
More than 1,200 feet above the surface and at or above
10,000 feet MSL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 statute miles 1,000 feet below
1,000 feet above
1 statute mile horizontal
3-1-5. VFR Cruising Altitudes and Flight Levels
(See TBL 3-1-2.)
TBL 3-1-2
VFR Cruising Altitudes and Flight Levels
If your magnetic course
(ground track) is:
And you are more than 3,000 feet above the
surface but below 18,000 feet MSL, fly:
And you are above 18,000 feet
MSL to FL 290, fly:
0 to 179 . . . . . . . . . . . . . . . . Odd thousands MSL, plus 500 feet
(3,500; 5,500; 7,500, etc.)
Odd Flight Levels plus 500 feet
(FL 195; FL 215; FL 235, etc.)
180 to 359 . . . . . . . . . . . . . . Even thousands MSL, plus 500 feet
(4,500; 6,500; 8,500, etc.)
Even Flight Levels plus 500 feet
(FL 185; FL 205; FL 225, etc.)
2/14/08 AIM
Controlled Airspace 3-2-1
Section 2. Controlled Airspace
3-2-1. General
a. Controlled Airspace. A generic term that
covers the different classification of airspace
(ClassA, ClassB, Class C, Class D, and Class E
airspace) and defined dimensions within which air
traffic control service is provided to IFR flights and
to VFR flights in accordance with the airspace
classification. (See FIG 3-2-1.)
b. IFR Requirements. IFR operations in any
class of controlled airspace requires that a pilot must
file an IFR flight plan and receive an appropriate ATC
clearance.
c. IFR Separation. Standard IFR separation is
provided to all aircraft operating under IFR in
controlled airspace.
d. VFR Requirements. It is the responsibility of
the pilot to insure that ATC clearance or radio
communication requirements are met prior to entry
into Class B, Class C, or Class D airspace. The pilot
retains this responsibility when receiving ATC radar
advisories. (See 14 CFR Part 91.)
e. Traffic Advisories. Traffic advisories will be
provided to all aircraft as the controller's work
　
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