Page 271 - Planning and Design of Airports

232 Airp o r t D e sign

Aerodrome Code Letter
A B C D E
Gradient (%)
Pavement longitudinal
Maximum 3.0 3.0 1.5 1.5 1.5
Maximum change 4.0 4.0 3.33 3.33 3.33
Pavement transverse
Maximum 2.0 2.0 1.5 1.5 1.5
Strip
Maximum transverse
Graded portion
Upward 3.0 3.0 2.5 2.5 2.5
Downward 5.0 5.0 5.0 5.0 5.0
Ungraded portion
Upward 5.0 5.0 5.0 5.0 5.0
Vertical curve (m)
Minimum length ∗ 25 25 30 30 30

* For each 1 percent of grade change.
Source: International Civil Aviation Organization [2, 3, 4].
TABLE 6-21 Taxiway Gradient Standards

The separation criteria are presented in Table 6-18. The values
indicated in this table are based upon the specifications using the
largest wingspan in each airplane design group. As noted in this
table, the required separations may be reduced to those that would
result using the actual wingspan of the design aircraft.

ICAO Separation Criteria
The separation criteria adopted by ICAO are also predicated upon
the wingtips of the aircraft for which the taxiway and taxilane system
have been designed and providing a minimum wingtip clearance on
these facilities, but also consider a minimum clearance between the
outer main gear wheel and the taxiway edge. The required separation
between taxiways or between a taxiway and a taxilane requires a
minimum wingtip clearance, C , of 3 m for aerodrome code letter
1
A and B runways, 4.5 m for aerodrome code letter C runways, and