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On an aerodrome equipped with parallel runways, the designation number of each runway is supplemented as follows…

  • A
    for three parallel runways, by adding “L” to the designation of the runway farthest to the left, adding one “R” to the central runway and adding two “R” to the designation of the runway farthest to the right.
  • B
    for two parallel runways, by adding “10” to the left runway designation and by subtracting “10” from the right runway designation.
  • C
    for three parallel runways, by the letter “L” and “R” for the outer runways and no letter supplement for the central runway.
  • D
    for two parallel runways, by the letter “L” and “R” in the sequence from left to right.

ICAO Annex 14
5.2.2 Runway designation marking

5.2.2.5 In the case of parallel runways, each runway designation number shall be supplemented by a letter as follows, in the order shown from left to right when viewed from the direction of approach:

— for two parallel runways: “L” “R”;
— for three parallel runways: “L” “C” “R”;
— for four parallel runways: “L” “R” “L” “R”;
— for five parallel runways: “L” “C” “R” “L” “R” or “L” “R” “L” “C” “R”; and
— for six parallel runways: “L” “C” “R” “L” “C” “R”.

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