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 MIL-HDBK-1021/1
TABLE 18
Design Criteria for Towways
_____________________________________________________________________________
Item
Type
Criteria
_____________________________________________________________________________
Load-bearing capacity
MIL-HDBK-1021/2/4.
DM 21.03.
Width
Carrier
Minimum:
36 feet.
Patrol and
Minimum:
40 feet.
transport
Rotary-Wing
Minimum:
35 feet.
Surface
Smoothness
Maximum irregularity shall
be + 1/8 inch per 10 feet
for rigid pavement and +
1/4 inch in 10 feet for
flexible pavement in any
direction.
Grades
Longitudinal
Maximum:
5%.
Transverse
Minimum:
-1%.
Maximum:
-l.5%.
Curves
Horizontal
Minimum radius: 150 feet.
Vertical
Maximum rate of change of
grade shall be 2.0% per 100
feet.
Successive
Curves shall be
curves
separated by a minimum of
150 feet of tangent.
Vertical clearance
Carrier
Minimum:
25 feet.
Patrol and
Minimum:
45 feet.
transport
Rotary-Wing
Minimum:
30 feet.
Lateral clearance
Carrier
50 feet on both sides of
centerline.
Patrol and
75 feet on both sides
transport
of centerline.
Rotary-Wing
45 feet on both sides of
centerline.
Fillets at intersections
Minimum radius:
100 feet.
Shoulders
Provide proper drainage and
prevent erosion along edge
of pavement.
Marking
Centerline
See NAVAIR 51-50AAA-2, mark as
a taxiway.
Traffic lights
As required at intersections.
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