The largest runway in the world is the huge 11,917 m (39,098 ft) long, 274 m (899 ft) wide lake bed runway 17-35 at Edwards Air Force Base in California – a landing site for the Space Shuttle amongst other aircraft. There should also be no obstruction for a minimum 77.5m on either side of the runway.
LAX RUNWAY NUMBERS CODE
Code F aircraft require runways to be at least 60m wide with another 7.5m of shoulders on each side i.e. Passenger jetliners are classified based on the width of their wings, and undercarriage width, as Code C (single aisle Airbus A320, Boeing 737 family), Code D (twin aisle Airbus A330, 340, Boeing 767, 777), Code E (Boeing 747) to Code F (Airbus A380 and Antonov An-124, An-225). The width of the runway is dictated by the largest aircraft the airport would like to handle. Bigger jets and fighter aircraft require longer runways. However a typical runway is about 10,000 ft long. A typical example will be Chicago’s O’Hare (ORD) airport which has seven runways aligned in 04-22 (L,R), 09-27 (L,R), 10-28, and 14-32 (L,R). If the winds are more variable in direction and the airport is large enough to financially justify the investment, airports can have several runways in different directions, so that a runway can be selected that is most nearly aligned with the wind. Thus, runway orientations are decided on the historical winds and directions. flying speed, at a relatively lower ground speed which reduces the actual take-off or landing distance needed. This is to increase the speed of air over the wings i.e. How is runway orientation decided?įor normal fixed-wing aircraft it is advantageous to perform take-offs and landings into the wind. At Dallas-Fort Worth, there are five parallel runways, named 17L, 17C, 17R (on the east side of the airport), and 18L, and 18R (on the west side of the airport), even though all five runways are oriented at a heading of 175.4°. In such cases the traditional left, centre, right designations cannot be used and the the runway identifiers are shifted by 10 degrees or 1 digit on the runway number). More than three parallel runways?Ĭertain ultra-large airports most notably Atlanta Hartsfield-Jackson (ATL), Los Angeles International (LAX) and Dallas-Fort Worth (DFW) have more than three parallel runways. Runway One Seven Left (17L) becomes Runway Three Five Right (35R). In the reverse direction the Left and Right get reversed. Similarly, when Singapore’s Changi airport added a third runway out in the sea, the new runway became 02R, and the existing 02R became 02C. When an airport has two or three parallel runways pointing in the same direction, each runway is identified by appending Left (L), Right (R) and if there is a third runway, Centre (C), to the number - for example Dallas-Fort Worth International airport, has Runways One Seven Left (17L), One Seven Centre (17C), and One Seven Right (17R). (In aviation radio communications the number nine is pronounced niner for better clarity and to avoid confusion with the number five when spoken).
In case of runways with a single digit number, a leading zero is added, for example runway zero niner. Correct pronunciationįor better clarity in radio communications, each digit of a runway number is pronounced individually i.e. In India most airports have an east-west runway 09-27. Since a runway can be normally used in two directions (there are always exceptions), it will have a second number which will always differ by 18 (180° or half way across the compass). A runway pointing to the north with a heading from 355° to 004° will be generally given the number 36 (1/10th of 360° ±5°), similarly runway 09 points east (85°~94°), runway 18 is south (175°~184°), and runway 27 points west (265°~274°). The two digit number is essentially 1/10th of the magnetic heading of the runway ±5° i.e. On a compass North is 360°, East is 90° South is 180° and West is 270°. The number indicates the runway’s heading. It forms an integral part of an airport’s aircraft movement area. Simply put, a runway is a strip of land where aircraft take-off and land. Yet, what are the various terms associated with runways? Runway numbers are very commonly used in aviation related stories and many a frequent flier knows which runway they land or take-off from, especially at their home and other frequented airports. What is the meaning of it and who issues it?Īn innocent question on one of the aviation forums I visit, got me thinking. Hi, I have seen runway number like 29/11.
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