Page 220 - Planning and Design of Airports

Geometric Design of the Airfield 185

FIGURE 6-6 Planned simplifi ed runway confi guration: Chicago O’Hare International
Airport (Courtesy Chicago O’Hare Modernization program).
allowable crosswind components not exceeding specified limits
based upon the airport reference code associated with the critical
aircraft that has the shortest wingspan or slowest approach speed.
When the wind coverage is less than 95 percent a crosswind runway
is recommended.
The allowable crosswind is 10.5 kn (12 mi/h) for Airport Refer-
ence Codes A-I and B-I, 13 kn (15 mi/h) for Airport Reference Codes
A-II and B-II, 16 kn (18.5 mi/h) for Airport Reference Codes A-III,
B-III, C-I, C-II, C-III and C-IV, and 20 knots (23 mph) for Airport Ref-
erence Codes A-IV through D-VI [5].
ICAO also specifies that runways should be oriented so that air-
craft may be landed at least 95 percent of the time with crosswind
components of 20 kn (23 mph) for runway lengths of 1500 m more,
13 kn (15 mi/h) for runway lengths between 1200 and 1500 m, and
10 kn (11.5 mi/h) for runway lengths less than 1200 m [1, 2].