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.
[0 ft]
[0 ft]
facilities.
See
See
See Remarks
Above the established
Remarks
Remarks
elevations of the landing
surface.
Navy and Marine Corps
Standard
Air Force and
do not have criteria for
Army
unidirectional
unidirectional
ingress/egress.
ingress/egress;
See Remarks.
11
Elevation of
C
224.03 m
Air Force and Army.
Approach-
(735 ft)
Departure
Clearance
Surface at
End of
Sloped
Portion
295.35 m (969 ft)
N/A
Navy and Marine Corps.
See Remarks
Above the established
elevation of the landing
surface.
12
Transitiona
H
7:1
7:1
7:1
Army
l Surface
Slope
4:1
4:1
7:1
Air Force
4:1
4:1
N/A
Navy and Marine Corps
See Remarks
See Figures 4.2, 4.6, 4.7,
and 4.8 for shape of
Transitional Surface.
The Transitional Surface
starts at the lateral edges
of the primary surface
and the approach-
4-33
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