[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR71.75]

[Page 152-153]
 
                     TITLE 14--AERONAUTICSAND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
PART 71--DESIGNATION OF CLASS A, CLASS B, CLASS C, CLASS D, AND CLASS E
 AIRSPACE AREAS; AIRWAYS; ROUTES; AND REPORTING POINTS--Table of Contents
 
                       Subpart E--Class E Airspace
 
Sec. 71.75  Extent of Federal airways.

    (a) Each Federal airway is based on a center line that extends from 
one navigational aid or intersection to another navigational aid (or 
through several navigational aids or intersections) specified for that 
airway.
    (b) Unless otherwise specified:
    (1) Each Federal airway includes the airspace within parallel 
boundary lines 4 miles each side of the center line. Where an airway 
changes direction, it includes that airspace enclosed by extending the 
boundary lines of the airway segments until they meet.
    (2) Where the changeover point for an airway segment is more than 51 
miles from either of the navigational aids defining that segment, and--
    (i) The changeover point is midway between the navigational aids, 
the airway includes the airspace between lines diverging at angles of 
4.5 deg. from the center line at each navigational aid and extending 
until they intersect opposite the changeover point; or
    (ii) The changeover point is not midway between the navigational 
aids, the airway includes the airspace between lines diverging at angles 
of 4.5 deg. from the center line at the navigational aid more distant 
from the changeover point, and extending until they intersect with the 
bisector of the angle of the center lines at the changeover point; and 
between lines connecting these points of intersection and the 
navigational aid nearer to the changeover point.
    (3) Where an airway terminates at a point or intersection more than 
51 miles from the closest associated navigational aid, it includes the 
additional airspace within lines diverging at angles of 4.5 deg. from 
the center line extending from the associated navigational aid to a line 
perpendicular to the center line at the termination point.
    (4) Where an airway terminates, it includes the airspace within a 
circle centered at the specified navigational aid or intersection having 
a diameter equal to the airway width at that point. However, an airway 
does not extend into an oceanic control area.
    (c) Unless otherwise specified--
    (1) Each Federal airway includes that airspace extending upward from 
1,200 feet above the surface of the earth to, but not including, 18,000 
feet MSL, except that Federal airways for Hawaii have no upper limits. 
Variations of the lower limits of an airway are expressed in digits 
representing hundreds of feet above the surface or MSL and, unless

[[Page 153]]

otherwise specified, apply to the segment of an airway between adjoining 
navigational aids or intersections; and
    (2) The airspace of a Federal airway, within the lateral limits of a 
Class E airspace area with a lower floor, has a floor coincident with 
the floor of that area.
    (d) A Federal airway does not include the airspace of a prohibited 
area.