Chapter 4
Table 4.8. Rotary-Wing Imaginary Surfaces for IFR Approaches.
Helicopter
Runway
and
Item
Item
Legend in
Landing
No. Description Figures
Lanes
Helipad
Remarks
Navy and Marine
Standard
Air Force and
Corps do not have
Army same
criteria for
direction
unidirectional
ingress/egress;
ingress/egress.
See Remarks.
departure clearance
surface. It continues
outward and upward at
the prescribed slope to
45.72 m (150 ft) above
the established airfield
elevation.
13
Horizontal
E
1,143 m
N/A
N/A
An imaginary surface
Surface
[3,750 ft]for
located 45.72 m [150']
Radius
25:1
above the established
approach-
heliport elevation,
departure
formed by scribing an
surfaces
arc about the end of
each runway or landing
lane, and inter-
connecting these arcs
with tangents.
N/A
N/A
1,554.48m
(5,100 ft)
for 34:1
approach-
departure
surfaces
N/A
1,402.08
1,402.08 m
Circular in shape,
m
[4,600 ft]
located 45.72 m [150 ft]
[4,600 ft]
above the established
heliport or helipad
elevation, defined by
scribing an arc with a
1,402.08 m [4,600 ft]
radius about the center
point of the helipad.
14
Elevation
H
45.72 m
45.72 m
45.72 m
of
[150 ft]
[150 ft]
[150 ft]
Horizontal
Surface
4-34
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