30 June 2001
4. DESIGN PASS LEVELS FOR AIR FORCE PAVEMENTS. Aircraft traffic data reports indicating
type and frequency of aircraft traffic at selected Air Force bases have been analyzed to establish criteria
to be used in the design of airfield pavements. These design pass levels are shown in Table 3-1 for the
different traffic areas and aircraft types. Airfield pavements may be designed for alternate pass levels if
dictated by the intended use of the facility and subject to the approval of the appropriate Air Force Major
5. RESIN MODIFIED PAVEMENT. Resin Modified Pavement (RMP) can be used as an Air Force
pavement except for runways and high-speed taxiways. RMP can be used for helipads and heliport
pavements and for both rotary-wing and fixed-wing aprons.
a. Location. Paved shoulders should be provided for airfield and heliport construction as
designated in UFC 3-260-01.
b. Structural Requirements. As a minimum, paved shoulders shall be designed to support a load
of 4,535 kilograms (10,000 pounds) imposed by a single wheel with a tire pressure of 0.69 MPa
(100 psi). When shoulder pavements are to be used by support vehicles (snow removal equipment, fire
trucks, fuel trucks, etc.), the shoulders should be signed accordingly for whichever governs.
7. AGGREGATE SURFACED HELICOPTER SLIDE AREAS AND HELIPORTS. Geometric and
structural criteria for the design of aggregate surfaced helicopter slide areas and heliports are listed
below. These criteria are applicable to all Air Force organizations with pavement design and
a. Geometric Criteria. Geometric criteria can be found in UFC 3-260-01.
Structural Criteria. Airfield structural design criteria are presented below.
(1) Thickness (Non-Frost Areas). Factors which determine thickness are the California
Bearing Ratio (CBR) of the subgrade, helicopter weight, and passes. The minimum required thickness
is 150 millimeters (6 inches). Use Figure 3-6 for design of aggregate surface thickness for helicopters.
Enter Figure 3-4 with the subgrade CBR (see Chapter 6 for selection of subgrade CBR) to determine the
thickness required for a given load and pass level. The thickness determined from the figure may be
constructed of surface course material for the total depth over the natural subgrade; or in a layered
system consisting of select material, subbase, and surface course over compacted subgrade for the
same total depth. Check the layered section to ensure sufficient material protects the underlying layer,
based upon the CBR of the underlying layer. The top 150 millimeters (6 inches) must meet the
(2) Select Materials and Subbases. Select design CBR values materials and subbases in
accordance with Chapter 7, except as modified in Table 3-3.
(3) Thickness (Frost Areas). In areas where frost effects impact pavement design, there are
additional considerations concerning thicknesses and required layers in the pavement structure. For
frost design, soils are divided into eight groups as shown in Table 3-4. Only the non-frost-susceptible
(NFS) group is suitable for base course. NFS, S1, or S2 soils may be used for subbase course, and any