Owais Crawford
Airport runway lights are a critical component of the airport lighting system, ensuring safe aircraft landings and takeoffs during the night or in low-visibility conditions. These lights provide visual guidance to pilots, replacing the runway markings that are only visible during the day. The lighting system consists of various types of lights, such as approach lights, runway edge lights, centreline lights, and threshold lights, each with specific colours and spacing that convey important information to pilots. For instance, white lights indicate the direction of the runway, while red lights signal the end of the runway. Given the safety implications, it is crucial for pilots to comprehend the configuration, spacing, colour, and purpose of these runway lights. This knowledge empowers pilots to confidently navigate the complex lighting environment during nighttime or low-visibility landings.
| Characteristics | Values |
|---|---|
| Purpose | Guide pilots safely to the airport, especially during takeoff and landing |
| Visibility | Clearly visible during the day and night and in all operating conditions |
| Types | Runway lights, approach lights, taxiway lights, in-pavement lights, threshold lights, etc. |
| Colors | White, red, yellow, green, and blue |
| Spacing | Runway edge lights have a maximum spacing of 200 feet between each other |
| Control | Air Traffic Control Tower (ATCT), Radio control, Flight Service Station (FSS), or at the pilot's discretion |
| Compliance | ICAO-compliant (compliant with international aviation regulations) |
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What You'll Learn
Runway lights colour meanings
Runway lights are essential for pilots, providing critical visual cues during takeoff, landing, and taxiing. The lights are colour-coded to help pilots navigate the runway and understand their position. Here is a breakdown of the meanings of the different runway light colours:
White Lights
White lights are used exclusively for runway lighting to prevent confusion with other surfaces. They are used to indicate the runway edge, threshold, and centre line. On instrument runways, white lights change to yellow for the final 2,000 feet or half the runway length, whichever is shorter, to form a caution zone for landings.
Red Lights
Red lights are used in various contexts on runways. A row of red lights running parallel to the runway indicates a displaced threshold, meaning that area is not suitable for landings but can be used to begin takeoffs. Red lights are also used in the visual approach slope indicator (VASI) system, which provides descent guidance to pilots. In this system, a steady red light indicates that the aircraft is slightly below the glide path, and a pulsating red light means the aircraft is further below the desired path.
Green Lights
Green lights are used to indicate the centre line of taxiways. They also face outward from the runway end, indicating the threshold to landing aircraft.
Yellow Lights
Both runways and taxiways use yellow lights, generally as a sign of caution. On runways, yellow lights warn pilots that less than 2,000 feet of the runway remains, or less than half the runway length, whichever is shorter.
Blue Lights
Blue lights outline the edges of taxiways, helping pilots distinguish taxiways from runways.
It is important to note that pilots must also pay attention to the configuration, spacing, and intensity of runway lights, as these factors provide additional information and ensure safe airport operations.
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Lighting system requirements
Airport lighting systems are critical for pilots to navigate landing and takeoff safely at night or in low-visibility conditions. These lighting systems must be clearly visible, functional in all operating conditions, and ICAO compliant. Here are the key lighting system requirements:
Runway Edge Lights:
Runway edge lights are white and have a maximum spacing of 200 feet between each other, with a distance of 2 to 10 feet from the edge of the usable runway. They provide visual guidance to pilots, replacing the runway markings that are only visible during the day.
Runway Centerline Lights:
Runway centerline lights are also white and are installed at larger airports to help pilots keep their aircraft aligned during takeoff and landing. They are spaced in 50-foot intervals down the length of the runway. The lights turn red and white in the last 3,000 feet, warning pilots that the end of the runway is approaching. The last 1,000 feet of the runway is marked by red lights.
Taxiway Lights:
To prevent confusion, taxiway edge lights are blue, while taxiway centerline lights are green. These lights are less bright than runway lights and are almost invisible from the air since pilots only use them while navigating on the airfield.
Approach Lights:
Approach lights are unidirectional white lights that are blinking or steady. They are the first lights pilots encounter during landing, indicating the direction of the runway. The simplest approach light system consists of 17 lights in a cross formation, commonly found at regional and domestic airports. More advanced systems, like those at major international airports, incorporate yellow and red lights in addition to white.
Runway Threshold Identification Lights (RTIL):
RTIL is a unidirectional, flashing white light that identifies the beginning of a runway.
Runway End Lights:
Runway end lights are unidirectional red lights that mark the end of a runway, indicating that there is no further space for aircraft movement beyond that point.
Precision Approach Path Indicator (PAPI):
PAPI is a bicolor light system that helps pilots maintain the correct path when approaching the runway. It consists of four lighting fixtures, each providing either a red or white light output, depending on the aircraft's height relative to the ground.
Pilot-Controlled Lighting (PCL) Systems:
Some airports, especially those without a tower, use PCL systems, which can be radio-activated by pilots within a 5-mile radius. Pilots must be aware that PCL systems turn off 15 minutes after activation, and landing should be completed before that cutoff.
Brightness and Intensity Control:
Controllers can adjust the brightness of in-pavement lights to ensure optimal visibility under various lighting and weather conditions. Runway edge lights, in-pavement lights, and approach lights have intensity controls that can be varied according to the pilot's requests.
Radio Control:
Selected airports offer radio control of lighting systems, allowing pilots to control the lights by keying their aircraft's microphone. This feature is particularly useful at locations without specified lighting hours or a control tower. All radio-controlled lighting systems at an airport operate on the same radio frequency, usually CTAF.
It is important to note that pilots should familiarize themselves with the lighting configurations, spacing, colors, and purposes of different airport lights to ensure safe navigation during low-visibility conditions.
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Runway lights spacing
Runway lighting systems are made up of four key attributes: configuration, colour, coverage, and candela. The International Civil Aviation Organization (ICAO) studies and issues international airport lighting standards, which are governed in the United States by the Federal Aviation Authority (FAA).
The spacing of runway lights is an important part of the configuration. For an ICAO instrument runway, the lighting rows should be in intervals of no more than 60 meters. For non-instrument runways, the interval should not exceed 100 meters. Under the FAA’s lighting standards, runway light spacing is 200 feet for both Instrument Flight Rules (IFR) and Visual Flight Rules (VFR) runways.
Runway edge lights are usually spaced 60m apart. Touchdown zone lights are spaced 30m apart, and centreline lights are spaced 15m apart. The light spacing will be published in the AIP. Most instrument runways have 60m spacing or less. Visual runways can have up to 100m spacing.
Runway edge lights are located on a line parallel to the runway centre line, at least 2 ft (0.6 m) but no more than 10 ft (3 m) from the edge of the full-strength pavement designated for runway use. On runways used by jet aircraft, a spacing of 10 ft (3 m) is recommended to avoid possible damage by jet blasts. On runways not used by jet aircraft, a spacing of 2 ft (0.6 m) is recommended. The edge lights are uniformly spaced symmetrically about the runway centre line, such that a line between light units on opposite sides of the runway is perpendicular to the runway centre line.
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Lighting configurations
Runway lights are essential for pilots to safely take off and land at night or in low-visibility conditions. The lighting configurations for runways and taxiways differ to prevent confusion.
Taxiway Lighting
Taxiway edge lights are blue, while runway edge lights are white. Taxiway centerline lights are green, while runway centerline lights are white. Taxiway centerline lead-on and lead-off lights use alternating green and yellow lights. When approaching a runway from a taxiway, the centerline lights will be all yellow.
Runway Lighting
Runway edge lights have a maximum spacing of 200 feet between each other and are 2 to 10 feet from the edge of the usable runway. Precision instrument runways at larger airports might have runway centerline lights installed. These lights are spaced in 50-foot intervals down the length of the runway. The lights are white until the last 3,000 feet of the runway. At that point, they alternate red and white for 2,000 feet, warning pilots that the end of the runway is approaching. For the last 1,000 feet of the runway, the lights are red.
Approach Lighting
Approach lights are unidirectional white lights that blink or remain steady. They are located before the runway and function to indicate the direction of the runway. The simplest approach lighting system has a cross form and consists of 17 lights. This type of lighting is usually installed at regional and domestic airports. More advanced systems have a more complex structure and include lights of multiple colors—white, yellow, and red. This type of lighting can be found at large international airports like Dubai International Airport, Atlanta Airport, and Heathrow Airport.
Pilot-Controlled Lighting (PCL)
Pilot-controlled lighting systems turn off 15 minutes after activation. PCL systems are designed to be radio-activated by pilots within 5 miles of the airport. The pilot can turn on the lights and select the preferred illumination intensity.
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Lighting controls
The intensity of runway edge lights, in-pavement lights, and approach lights can be adjusted to meet the pilot's request. Sequenced flashing lights (SFL) can be turned on and off, but only some SFL systems have intensity control. Controllers can set in-pavement lights to one of five brightness levels to assure maximum conspicuity under all visibility and lighting conditions.
At some airports, radio control of lighting is available to provide pilots with control of the lights by keying the aircraft's microphone. This is particularly useful at locations without specified hours for lighting and where there is no control tower or FSS, or when the tower or FSS is closed (locations with a part-time tower or FSS or specified hours). All lighting systems that are radio-controlled at an airport, whether on a single runway or multiple runways, operate on the same radio frequency, usually CTAF.
Some airports use a pilot-controlled lighting system (PCL), which can provide cost savings by reducing electrical costs. This system is designed to be radio-activated by pilots within 5 miles of the airport. The pilot can turn on the lights and select the preferred illumination intensity by keying the microphone button. Lights that can be activated by PCL include runway lights, VASI, PAPI, REIL, and sometimes taxiway lights. It is important to note that PCL systems turn off 15 minutes after activation, so pilots must ensure they have completed their landing before that cutoff.
The Air Traffic Control Tower (ATCT) generally controls the operation of approach and runway lighting. However, pilots may request and, in some cases, control lighting themselves.
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