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.
Remarks
Remarks
primary surface.
6
C
7,620.00 m
7,620.00
7,620.00 m
For Army and Air Force
Length of
[25,000 ft]
m
[25,000 ft]
facilities.
Sloped
[25,000 ft]
Portion of
Approach-
Departure
Surface
NA
For Navy and Marine
7,383.78 m
7,383.78
Corps facilities.
[24,225 ft]
m
[24,225 ft]
See
See
See Remarks
Measured horizontally
Remarks
Remarks
C
34:1
34:1
34:1
For Army and Air Force
7
Slope of
Facilities.
Approach-
Departure
Surface
Navy and Marine Corps
Standard
Air Force and
do not have criteria for
Army unidirection-
unidirectional
al ingress/egress;
ingress/egress.
See Remarks.
25:1
25:1
NA
For Navy and Marine
Corps facilities.
See
See
See Remarks
Slope ratio is horizontal
Remarks
Remarks
to vertical.
34:1 is 34 meters [feet]
horizontal to 1 meter
[foot] vertical.
4-31
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