Chapter 3
Table 3.7. Airspace Imaginary Surfaces.
Class A Runway
Class B
Requirement
Runway
Item
Item
Requirement
No.
Description
Legend
VFR
IFR
VFR & IFR
Remarks
of slope
G
NA
4,419.60 m
24
Distance to
[14,500 ft]
outer edge of
conical
surface
G
NA
9,144.00 m
Extending horizontally
25
Width of outer
[30,000 ft]
outward from the outer
horizontal
periphery of the conical
surface
surface.
G
NA
152.40 m
Above the established airfield
26
Elevation of
[500 ft]
elevation.
outer
horizontal
surface
G
NA
13,563.60 m
An imaginary surface formed
27
Distance to
[44,500 ft]
by scribing an arc with a
outer edge of
radius of 13,563.6m about the
outer
centerline at each end of each
horizontal
runway, and interconnecting
surface
the arcs with tangents.
H
152.40 m
152.40 m
At Army airfields.
28
Start of
[500 ft]
[500 ft]
Transitional
Surface
304.8 m
Air Force, Navy, and Marine
(1,000 ft)
Corps.
H
See Remarks
The Transitional Surface ends
29
End of
at the Inner Horizontal
Transitional
Surface, Conical Surface,
Surface
Outer Horizontal Surface, or
at an elevation of 45.72 m
[150 ft].
3-40
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