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
[1,000 ft]
Air Force, Navy, and Marine
609.60 m
Corps airfields
[2,000 ft]
See Remarks
Centered on the runway
centerline. At airfields where
the lateral clearance was
established according to the
previous 750 ft [228.60 m]
from centerline criterion, the
1500 ft [228.60 m] distance
may remain.
For USAF, the Primary
Surface width was expanded
10 Nov 64
For Navy and Marine Corps,
this surface was expanded on
12 May 81
2
Primary
A
Runway Length + 60.96 m [200 ft]
Primary surface extends 60.96
surface length
at each end
m [200 ft] beyond each end of
the runway.
Primary
The elevation of any point on the
3
A
surface
primary surface is the same as the
elevation
elevation of the nearest point on the
runway centerline.
B
Also see Table 3.5
Graded Area only. For land
4
Clear Zone
use outside the graded area of
Surface
the Clear Zone, apply AICUZ
(Graded Area)
standards.
C
60.96 m
Measured from the end of the
5
Start of
[200 ft]
runway.
Approach-
Departure
Surface
7,620.00 m
Measured horizontally.
C
3,048.00 m
6,096.00
6
Length of
[25,000 ft]
[10,000 ft]
m
sloped portion
[20,000
of Approach-
ft]
Departure
Surface
3-36
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