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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.)
2/19/04 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
(Class A, Class B, 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
situation permits.
f. Safety Alerts. Safety Alerts are mandatory
services and are provided to ALL aircraft. There are
two types of Safety Alerts:
1. Terrain/Obstruction Alert. A Terrain/Obstruction
Alert is issued when, in the controller’s
judgment, an aircraft’s altitude places it in unsafe
proximity to terrain and/or obstructions; and
2. Aircraft Conflict/Mode C Intruder Alert.
An Aircraft Conflict/Mode C Intruder Alert is issued
if the controller observes another aircraft which
places it in an unsafe proximity. When feasible, the
controller will offer the pilot an alternative course of
action.
FIG 3−2−1
Airspace Classes
MSL - mean sea level
AGL - above ground level
FL - flight level
CLASS B
CLLASS C
CLAASS E
CLASS D
CLASS G CLASS G CLASS G
Nontowered
Airport
FL 600
18,000 MSL
14,500 MSL
700 AGL 1,200 AGL
CLLASS A
AIM 2/19/04
3−2−2 Controlled Airspace
g. Ultralight Vehicles. No person may operate an
ultralight vehicle within Class A, Class B, Class C, or
Class D airspace or within the lateral boundaries of
the surface area of Class E airspace designated for an
airport unless that person has prior authorization from
the ATC facility having jurisdiction over that
airspace. (See 14 CFR Part 103.)
h. Unmanned Free Balloons. Unless otherwise
authorized by ATC, no person may operate an
unmanned free balloon below 2,000 feet above the
surface within the lateral boundaries of Class B,
Class C, Class D, or Class E airspace designated for
an airport. (See 14 CFR Part 101.)
i. Parachute Jumps. No person may make a
parachute jump, and no pilot−in−command may
allow a parachute jump to be made from that aircraft,
in or into Class A, Class B, Class C, or Class D
airspace without, or in violation of, the terms of an
ATC authorization issued by the ATC facility having
jurisdiction over the airspace. (See 14 CFR Part 105.)
3−2−2. Class A Airspace
a. Definition. Generally, that airspace from
18,000 feet MSL up to and including FL 600,
including the airspace overlying the waters within
12 nautical miles of the coast of the 48 contiguous
States and Alaska; and designated international
airspace beyond 12 nautical miles of the coast of the
48 contiguous States and Alaska within areas of
domestic radio navigational signal or ATC radar
coverage, and within which domestic procedures are
applied.
b. Operating Rules and Pilot/Equipment Requirements.
Unless otherwise authorized, all persons
must operate their aircraft under IFR. (See
14 CFR Section 71.33 and 14 CFR Section 91.167
through 14 CFR Section 91.193.)
c. Charts. Class A airspace is not specifically
charted.
3−2−3. Class B Airspace
a. Definition. Generally, that airspace from the
surface to 10,000 feet MSL surrounding the nation’s
busiest airports in terms of IFR operations or
　
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