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approach procedures without imposing a communications
requirement on pilots operating under VFR.
3. Airspace used for transition. There are
ClassE airspace areas beginning at either 700 or
1,200 feet AGL used to transition to/from the
terminal or en route environment.
4. En Route Domestic Areas. There are
ClassE airspace areas that extend upward from a
specified altitude and are en route domestic airspace
areas that provide controlled airspace in those areas
where there is a requirement to provide IFR en route
ATC services but the Federal airway system is
inadequate.
5. Federal Airways. The Federal airways are
Class E airspace areas and, unless otherwise
specified, extend upward from 1,200 feet to, but not
including, 18,000 feet MSL. The colored airways are
green, red, amber, and blue. The VOR airways are
classified as Domestic, Alaskan, and Hawaiian.
6. Offshore Airspace Areas. There are
ClassE airspace areas that extend upward from a
specified altitude to, but not including, 18,000 feet
MSL and are designated as offshore airspace areas.
These areas provide controlled airspace beyond
12miles from the coast of the U.S. in those areas
where there is a requirement to provide IFR en route
ATC services and within which the U.S. is applying
domestic procedures.
7. Unless designated at a lower altitude, Class E
airspace begins at 14,500 feet MSL to, but not
including, 18,000 feet MSL overlying: the 48contiguous
States including the waters within 12 miles from
the coast of the 48 contiguous States; the District of
Columbia; Alaska, including the waters within
12miles from the coast of Alaska, and that airspace
above FL600; excluding the Alaska peninsula west
of long.160 00'00''W, and the airspace below
1,500feet above the surface of the earth unless
specifically so designated.
f. Separation for VFR Aircraft. No separation
services are provided to VFR aircraft.

2/14/08 AIM
Class G Airspace 3-3-1
Section 3. Class G Airspace
3-3-1. General
Class G airspace (uncontrolled) is that portion of
airspace that has not been designated as Class A,
ClassB, Class C, Class D, or Class E airspace.
3-3-2. VFR Requirements
Rules governing VFR flight have been adopted to
assist the pilot in meeting the responsibility to see and
avoid other aircraft. Minimum flight visibility and
distance from clouds required for VFR flight are
contained in 14CFR Section 91.155.
(See TBL 3-1-1.)
3-3-3. IFR Requirements
a. Title 14 CFR specifies the pilot and aircraft
equipment requirements for IFR flight. Pilots are
reminded that in addition to altitude or flight level
requirements, 14 CFR Section 91.177 includes a
requirement to remain at least 1,000 feet (2,000 feet
in designated mountainous terrain) above the highest
obstacle within a horizontal distance of 4 nautical
miles from the course to be flown.
b. IFR Altitudes.
(See TBL 3-3-1.)
TBL 3-3-1
IFR Altitudes
Class G Airspace
If your magnetic course
(ground track) is:
And you are below
18,000 feet MSL, fly:
0 to 179 Odd thousands MSL, (3,000; 5,000; 7,000, etc.)
180 to 359 Even thousands MSL, (2,000; 4,000; 6,000, etc.)

2/14/08 AIM
Special Use Airspace 3-4-1
Section 4. Special Use Airspace
3-4-1. General
a. Special use airspace consists of that airspace
wherein activities must be confined because of their
nature, or wherein limitations are imposed upon
aircraft operations that are not a part of those
activities, or both. Except for controlled firing areas,
special use airspace areas are depicted on aeronautical
charts.
b. Prohibited and restricted areas are regulatory
special use airspace and are established in 14 CFR
Part73 through the rulemaking process.
c. Warning areas, military operations areas
(MOAs), alert areas, and controlled firing areas
(CFAs) are nonregulatory special use airspace.
d. Special use airspace descriptions (except CFAs)
are contained in FAA Order JO 7400.8, Special Use
Airspace.
e. Special use airspace (except CFAs) are charted
on IFR or visual charts and include the hours of
operation, altitudes, and the controlling agency.
3-4-2. Prohibited Areas
Prohibited areas contain airspace of defined
dimensions identified by an area on the surface of the
earth within which the flight of aircraft is prohibited.
Such areas are established for security or other
reasons associated with the national welfare. These
areas are published in the Federal Register and are
　
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