magnetic azimuth is 183 degrees, the runway designation marking would be 18; and for a magnetic
azimuth of 117 degrees, the runway designation marking would be 12. For a magnetic azimuth ending
in the number 5, such as 185 degrees, the runway designation marking can be either 18 or 19.
Supplemental letters, where required for differentiation of parallel runways, are placed between the
designation numbers and the threshold or threshold marking. For parallel runways, the supplemental
letter is based on the runway location, left-to-right, when viewed from the direction of approach: for
two parallel runways -- "L", "R"; for three parallel runways -- "L", "C", "R."
3.8. Runway Dimensions. The following paragraphs and tables present the design criteria for runway
dimensions at all aviation facilities except Short Fields and Training Assault Landing Zones. The
criteria presented in the tables are for all DoD components (Army, Air Force, Navy and Marine Corps)
except where deviations are noted.
3.8.1. Runway Dimension Criteria, Except Runway Length. Table 3.2 presents all dimensional
criteria, except runway length, for the layout and design of runways used primarily to support fixed-
wing aircraft operation.
3.8.2. Runway Length Criteria:
188.8.131.52. Army. For Army Class A runways, the runway length will be determined in accordance
with Table 3.3. Army Class B runways are used by Air Force aircraft, and therefore will have
the runway length determined by the Air Force MAJCOM.
184.108.40.206. Air Force. For Air Force Class A and Class B runways, the length will be determined
by the MAJCOM.
220.127.116.11. Navy and Marine Corps. Runway length computation for Navy and Marine Corps Class
A and Class B runways is presented in NAVFAC P-80.
3.8.3. Layout. Typical sections and profiles for Army, Air Force, Navy and Marine Corps airfield
runways and the associated airspace surfaces are shown in Figures 3.1 through 3.19.