30 June 2001
(a) Secondary (ladder) taxiways.
(b) The center 23-meter (75-foot) width of runway interior between 305-meter (1,000-foot)
runway ends and at runway edges adjacent to intersections with ladder taxiways.
(c) Hangar access aprons and floors and washrack pavements. At Air Mobility Command
Installations, hangar access aprons shall be designed as Medium Load Type C Traffic Area for the main
gear plus 3 meters (10 feet) on each side. The remainder of the access apron shall be Light Load
Type C Traffic Area.
(3) Light-load and auxiliary airfields.
(a) Full width of runway interior between the 305-meter (1,000-foot) runway ends and
secondary (ladder) taxiways.
(b) Hangar access aprons and floors.
(c) Washrack pavements.
(4) Assault landing zone. No Type C traffic areas.
d. Type D Traffic Areas. Type D traffic areas are those in which the traffic volume is extremely low
and/or the applied weight of operating aircraft is considerably lower than the design weight. The
pavement facilities considered to be Type D traffic areas are the edges of runways that are designed for
heavy-load, medium-load, and modified heavy-load airfields. Aircraft on heavy-, modified heavy-, or
medium-load runways seldom, if ever, operate outside of the center 23-meter (75-foot) width of the
runway interior, and the only traffic that will occur on the edges of the runway will be occasional heavy,
medium, or modified heavy aircraft loads or frequent light aircraft loads. Therefore, a substantial
reduction in required pavement thickness can be made. Pavement facilities considered to be Type D
traffic areas are as follows:
(1) Heavy-load airfields. The outside edges of the entire length of runway, except for the
approach and exit areas at taxiway intersections, are Type D traffic areas.
(2) Medium-load and modified heavy-load airfields. The outside edges of the entire length of
runway except for the approach and exit areas at taxiway intersections are Type D traffic areas.
(3) Light-load and auxiliary airfields. There are no Type D traffic areas on light-load or auxiliary
(4) Assault landing zone. No Type D traffic areas.
3. AIRCRAFT DESIGN LOADS FOR AIR FORCE PAVEMENTS. The design loads for light, medium,
heavy, modified heavy, auxiliary, and assault landing zone airfield pavements have been established by
the Air Force and are shown in Table 3-1. The concept is to design each airfield type for a mixture of
aircraft traffic at the loads shown. These loads represent the design gross weights for each type traffic
area and overruns on the airfield. Aircraft hangar floors or apron pavements shall not be designed for
jacking loads as long as the foot print of the jack is equal to or greater than the contact area of the
combined tires on the aircraft gear being elevated.