Chapter 4
Table 4.7. Rotary-Wing Imaginary Surface for VFR Approaches.
Helicopter
Runway
and
Landing
Item
Legend
Lane
No. Item Description
in Figures
Helipad
Remarks
Army does not
Air Force Air Force and
have VFR Rotary-
and Army Army VFR
Wing Runways or
VFR
Limited Use;
Landing Lanes.
Standard
Navy and
Marine
Corps
Standard
Helipad and
Hoverpoints
(see note 1)
each end
facilities.
3
Primary Surface
A
The elevation of any point on the primary
Elevation
surface is the same as the elevation of the
nearest point on the runway centerline or
at the established elevation of the landing
surface.
4
Clear Zone Surface
B
See Table
See Table
See Table 4.2
4.6
4.2
22.86 m
C
5
22.86 m [75 45.72 m
Start of Approach-
[75 ft]
[150 ft] from
ft]
Departure Surface
from GPI
GPI
from end of
runway or
landing
lane
C
365.76 m
365.76 m
365.76 m
Measured
6
Length of Sloped
[1,200 ft]
[1,200 ft]
[1,200 ft]
horizontally.
Portion of Approach-
Departure Surface
C
8:1
8:1
8:1
Slope ratio is
7
Slope of Approach-
horizontal to
Departure Surface
vertical.
8:1 is 8 meters
[feet] horizontal to
1 meter [foot]
vertical.
8
C
91.44 m
91.44 m
45.72 m
Centered on the
Width of Sloped
[300 ft]
[300 ft]
[150 ft]
extended center-
Portion of Approach-
line, and is the
Departure Surface at
4-26
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