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.
A
228.60 m
228.60 m
228.60 m
Centered on helipad.
1
Primary
[750 ft]
[750 ft]
[750 ft]
Surface
Width
2
Primary
A
The greater 472.44 m
114.3 m
Surface
distance of: [1,550 ft]
[375 ft]
Length
centered
centered on
runway
on GPI
GPI
length plus
60.96 m
[200 ft] at
each end; or
472.44 m
[1,550 ft]
3
Primary
A
The elevation of any point on the primary
Surface
surface is the same as the elevation of the
Elevation
nearest point on the runway or landing lane
centerline or established elevation of the
helipad.
4
Clear Zone
B
See Table
See Table
See Table 4.2
Surface
4.6
4.2
5
C
Measured 236.22 m
487.68 m
Army and Air Force
Start of
from the
[775 ft]
[1,600 ft]
facilities.
Approach-
center of the from GPI
from GPI
Departure
runway, the
Surface
greater
distance of:
runway
length plus
60.96m
[200 ft]; or
236.22m
[775 ft]
NA
Navy and Marine Corps
236.22 m
236.22 m
facilities.
[775 ft]
[775 ft]
from GPI.
from GPI.
See
See
See Remarks
Starts at the end of the
4-30
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