How far apart are runway centreline lights?
One row down the middle of the runway, about 15 m apart; 30 m only where RVR is 350 m or more and serviceability is proven.
Runway centreline lights form a single row along the runway centreline, at uniform intervals of approximately 15 m. The interval may be approximately 30 m only where the serviceability level of the lights can be demonstrated and the runway is used in RVR conditions of 350 m or more (ICAO Annex 14).
Where the centreline is not practicable, the row may be offset by not more than 60 cm to one side. Near the end of the runway the colour changes, but the spacing stays uniform.
Two rows, at not more than 60 m or 100 m apart. See Entry 32.
One row down the middle, at a much closer interval.
Frequently Asked Questions
Q1What is the spacing of runway centreline lights?
ICAO Annex 14 Volume I spaces runway centre line lights at uniform longitudinal intervals of approximately 15 m. The interval may be approximately 30 m only where the serviceability level of the lights specified as a maintenance objective can be demonstrated and the runway is intended for use in RVR conditions of 350 m or more. The FAA uses about 50 ft (15 m) for CAT II/III; check the edition in force.
Q2Why are centreline lights spaced so closely?
In low visibility the pilot sees only a short stretch of the runway. A close interval gives a continuous line of light to hold the aircraft on the centreline during landing roll and take-off, which is why 15 m is the standard and 30 m is allowed only as a conditional relaxation.
Q3Must the lights sit exactly on the centreline?
They are located along the centreline. Where that is not practicable, ICAO allows them to be offset to one side by not more than 60 cm, and the row is then kept on that same side.
Q4Does the colour change affect the spacing?
No. The spacing stays uniform. Only the colour changes near the end of the runway: white, then alternating red and white from 900 m to 300 m from the end, then all red for the last 300 m, to warn the pilot of the remaining length. On a runway shorter than 1,800 m the alternating red and white starts at the runway midpoint instead.
Q5How is this different from edge light spacing?
Edge lights form two rows along the runway sides, spaced at not more than 60 m or 100 m (Entry 32). Centreline lights form a single row down the middle, at a much closer interval.
Q6Where is runway centreline light spacing defined?
In ICAO Annex 14 Volume I (Chapter 5, runway centre line lights) and the Aerodrome Design Manual Part 4, and for FAA-regulated airports in FAA AC 150/5340-30 and the project specification. Always confirm against the current edition.
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