Page 269 - Planning and Design of Airports

230 Airp o r t D e sign

Aircraft Approach Category
A B C D E
Gradient (%)
Taxiway, shoulder and safety area
Longitudinal
Maximum 2.0 2.0 1.5 1.5 1.5
Maximum change 3.0 3.0 3.0 3.0 3.0
Taxiway transverse
Minimum 1.0 1.0 1.0 1.0 1.0
Maximum 2.0 2.0 1.5 1.5 1.5
Shoulder transverse
Minimum 3.0 3.0 1.5 * 1.5 * 1.5 *
Maximum † 5.0 5.0 5.0 5.0 5.0
Safety area transverse
Minimum 3.0 3.0 1.5 1.5 1.5
Maximum 5.0 5.0 3.0 3.0 3.0
Vertical curve (ft)
Minimum length ‡ 100 100 100 100 100
Minimum distance between 100 100 100 100 100
points of intersection §

* A minimum of 3 percent for turf.
† A slope of 5 percent is recommended for a 10-ft width adjacent to the pavement areas to
promote drainage.
‡ For each 1 percent of grade change.
§ Distance is multiplied by the sum of the absolute grade changes in percent.
Source: Federal Aviation Administration [6].
TABLE 6-19 Taxiway Gradient Standards

these facilities. The required separation between taxiways, between a
taxiway and a taxilane, or between a taxiway and a fixed or movable
object requires a minimum wingtip clearance of 0.2 times the wing-
span of the most demanding aircraft in the airplane design group
plus 10 ft. This clearance provides a minimum taxiway centerline to a
parallel taxiway centerline or taxilane centerline separation of 1.2
times the wingspan of the most demanding aircraft plus 10 ft, and
between a taxiway centerline and a fixed or movable object of 0.7
times the wingspan of the most demanding aircraft plus 10 ft. This