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Airspace, Section 4, Special Use Airspace, paragraphs
3−4−1 through 3−4−7.
b. Within these two categories, there are four
types:
1. Controlled,
2. Uncontrolled,
3. Special use, and
4. Other airspace.
c. The categories and types of airspace are dictated
by:
1. The complexity or density of aircraft
movements,
2. The nature of the operations conducted
within the airspace,
3. The level of safety required, and
4. The national and public interest.
d. It is important that pilots be familiar with the
operational requirements for each of the various types
or classes of airspace. Subsequent sections will cover
each class in sufficient detail to facilitate understanding.
3−1−2. General Dimensions of Airspace
Segments
Refer to Code of Federal Regulations (CFRs) for
specific dimensions, exceptions, geographical areas
covered, exclusions, specific transponder or equipment
requirements, and flight operations.
3−1−3. Hierarchy of Overlapping Airspace
Designations
a. When overlapping airspace designations apply
to the same airspace, the operating rules associated
with the more restrictive airspace designation apply.
b. For the purpose of clarification:
1. Class A airspace is more restrictive than
Class B, Class C, Class D, Class E, or Class G
airspace;
2. Class B airspace is more restrictive than
Class C, Class D, Class E, or Class G airspace;
3. Class C airspace is more restrictive than
Class D, Class E, or Class G airspace;
4. Class D airspace is more restrictive than
Class E 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.)
NOTE−
Student 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
Section 91.155(c).)
AIM 2/19/04
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
　
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