Section 2. Class C Airspace Standards
a. The criteria for considering a given airport as a
candidate for Class C designation must be based on factors
which include the volume of aircraft or number of enplaned
passengers, the traffic density, and the type or nature of
operations being conducted.
b. For a site to be considered as a candidate for Class
C airspace designation, it must meet the following criteria:
1. The airport must be serviced by an operational
airport traffic control tower and a radar approach control;
2. One of the following applies:
(a) An annual instrument operations count of 75,000 at
the primary airport.
(b) An annual instrument operations count of 100,000 at
the primary and secondary airports in the terminal area hub.
(c) An annual count of 250,000 enplaned passengers at
the primary airport.
Operations counts are available from the Office of Aviation
Policy and Plans, Statistics and Forecast Branch, APO-110.
Enplaned passenger counts may be obtained by contacting the
Office of Airport Planning and Programming, APP-1. Current
validated counts are normally available in mid-October of
the current year for the previous year.
C airspace area locations must include a single primary
airport around which the Class C airspace is designated.
a. General Design. Simplification and standardization of
Class C airspace areas are prime requisites. Lateral and
vertical limits must be in accordance with the following, to
the extent possible.
b. Lateral Limits. Class C airspace areas should
initially be designed as two circles centered on the airport
reference point. The inner circle should have a 5 NM radius,
and the outer circle should have a 10 NM radius. Wherever
possible, use VOR radials and DME arcs to define the
boundaries of the airspace and any of its sub-areas. It is
important, however, that prominent visual landmarks also be
considered to assist the VFR traffic preferring to remain
clear of this area.
c. Vertical Limits. The ceiling of a Class C airspace
should be 4,000 feet above the primary airport's field
elevation. The airspace within the 5 NM circle must extend
down to the surface. The airspace between the 5 and the 10
NM circle(s) must extend no lower than 1,200 feet AGL.
d. Variations. Any variation from the standard
configuration identified must be addressed in the
appropriate staff study. (The number of sub-areas must be
kept to a minimum.)
Though not requiring regulatory action, an Outer Area is the
procedural companion to Class C airspace. The normal radius
of an Outer Area is 20 NM from the primary Class C airspace
airport. Its vertical limit extends from the lower limits of
radio/radar coverage up to the ceiling of the approach
control's delegated airspace, excluding the Class C airspace
itself, and other airspace as appropriate.
16-2-4. TIME OF DESIGNATION
C airspace areas may be designated full-time or part-time.
If part-time, the effective time must be stated in local