Jazmin Li
Airport runway signs are standardised internationally by the International Civil Aviation Organization (ICAO) to enhance safety and improve efficiency. These signs are designed to guide pilots, providing clear and easily understandable information and directions. The signs are colour-coded, with red signs indicating an entrance to a runway, critical area or prohibited area, and yellow signs providing information. The numbers on the signs refer to the runway, and the letters refer to the taxiway. For example, a pilot approaching a red sign with white letters needs to be more alert as they are approaching the intersection of a runway. This is a holding position sign which requires specific ground clearance for the pilot to proceed.
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What You'll Learn
- Runway signs are always numerical, while taxiways are alphabetical
- Signs are placed on the left or right depending on the information they convey
- Holding position signs are the airport equivalent of stop signs
- Signs with yellow and black colours indicate directions to terminals, runways, etc
- Red signs with ILS in white lettering indicate the use of an Instrument Landing System
Runway signs are always numerical, while taxiways are alphabetical
Runway and taxiway signs are crucial for pilots to navigate airports safely and efficiently. These signs are standardised by the International Civil Aviation Organization (ICAO) to ensure consistency across airports worldwide. One key distinction between runway and taxiway signs is their naming conventions: runway signs are always numerical, while taxiway signs are alphabetical.
Runways are the designated paths for aircraft take-off and landing, and they are identified by numbers. For example, you might see signs pointing towards "Runway 9" or "Runway 36". These numbers are not sequential but are based on the compass bearing, specifically the magnetic azimuth, that the runway is oriented towards. So, if you're on Runway 9, you're heading east (90 degrees on a compass), and Runway 36 means you're moving north. Each end of the runway is identified separately, so an aircraft taking off towards the east on Runway 9-27 would be considered to be using Runway 9.
Taxiways, on the other hand, are the paths that aircraft use to move between different parts of the airport, such as between the hangar and the runway. Taxiway signs use letters to designate these paths. You might see signs for "Taxiway Bravo" or "Taxiway F". At smaller airports, a single letter may suffice, but larger airports may use double letters or alphanumeric identifiers due to the higher number of taxiways. So, you could also see signs for "Taxiway AA" or "Taxiway A2".
This distinction in naming conventions is important for pilots to quickly and accurately identify their location and navigate to the correct runway or taxiway. It's also helpful for passengers who want to understand their plane's movements on the ground. By understanding the basics of runway and taxiway signage, you can better interpret the signs you see next time you're at an airport.
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Signs are placed on the left or right depending on the information they convey
The placement of airport signs is not random. The first place to look for a sign is on the left side of the runway. Some signs will only be located on the left, while others can be on the right or the left depending on the type of information they convey. The location of other signs and the physical configuration of the airfield also play a role in sign placement. The purpose of airport signs is to guide pilots, so they are designed to be easily visible from the cockpit, providing clear and understandable information and directions.
Signs placed on the left or right of runways can indicate the location of taxiways or runways, boundaries of runways, or instrument landing system critical areas. These location signs are typically black with yellow lettering and a yellow border. They may also include arrows to provide directional information. For example, a sign with a black square and a yellow letter "B" indicates that you are currently on Taxiway Bravo.
On the other hand, destination signs, which guide pilots to terminals, runways, civil aviation areas, and cargo areas, are often placed on the right side of the runway. These signs usually have a yellow background with black inscriptions and arrows. For example, a yellow sign with "FBO" in black lettering will direct pilots to the Fixed-Base Operators, which provide services such as fuelling and baggage handling.
Additionally, runway holding position signs may be placed on either side of the runway. These signs indicate that aircraft must stop and wait for clearance before proceeding onto the runway. They are typically red with white lettering and are accompanied by pavement markings.
It's important to note that runway designations are always numerical, while taxiways are designated alphabetically. This distinction helps pilots quickly identify whether they are on the correct path.
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Holding position signs are the airport equivalent of stop signs
At tower-controlled airports, pilots may only taxi past a runway holding position sign once they have been cleared to do so by the tower. At non-towered airports, pilots are responsible for ensuring the runway is clear and that no other aircraft are on final approach before moving past the holding position sign.
Runway holding position signs have white lettering on a red background. They are placed adjacent to the holding position markings, which are painted on the surface of the runway. These markings consist of two solid yellow lines spaced two feet apart, connected by pairs of solid lines spaced ten feet apart extending across the width of the taxiway.
Holding position signs are especially important at airports with intersecting runways, where land and hold short (LAHSO) operations are conducted to increase airport capacity without causing safety issues. Aircraft land and "hold short" of an intersecting runway point, without crossing it.
In addition to runway holding position signs, there are also ILS critical area holding position signs. These are used when the instrument landing system is being used, and it is necessary to hold an aircraft on a taxiway at a location other than the standard holding position. These signs have the inscription "ILS" and are accompanied by the standard red-and-white holding position markings.
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Signs with yellow and black colours indicate directions to terminals, runways, etc
Airport signage is designed to guide pilots, providing clear and easily understandable information and directions. Signs with yellow and black colours fall under the category of ''information signs'. They are typically used to indicate directions to terminals, runways, civil aviation areas, and cargo areas. These signs are often referred to as ''destination signs'' and usually have a yellow background with black inscriptions and arrows.
Yellow and black signs can also be 'location signs', which are used to pinpoint the location of a taxiway or runway, the boundary of a runway, or an instrument landing system critical area. These signs are typically black with yellow lettering and a yellow border, with no arrows.
The yellow and black signs are not the only signs you'll see at an airport. There are also red signs, which are considered more urgent and require special clearance from air traffic control. These signs indicate that an aircraft is headed towards the intersection of a runway, where another plane might be preparing for takeoff. Red signs with white lettering are placed adjacent to runway holding position markings. They indicate the entrance to a runway, critical area, or prohibited area.
In addition to these, there are also mandatory instruction signs, which have a red background with white lettering. These signs provide crucial instructions that must be followed for safety and operational reasons.
Finally, there are the taxiway signs. Taxiways are identified by alphabetic designations, with single letters like "A", "B", "C", and so on. At larger airports, you may see double letters or alphanumeric identifiers due to the increased number of taxiways. These signs help pilots navigate the complex network of taxiways at busier airports.
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Red signs with ILS in white lettering indicate the use of an Instrument Landing System
Airport signs are designed to guide pilots, providing clear and easily understandable information and directions. These signs are placed on the left or right side of the runway, depending on the type of information they convey and the physical configuration of the airfield.
Red signs with "ILS" in white lettering are an example of mandatory instruction signs, which feature white text on a red background and are usually rectangular or square. These signs indicate the use of an Instrument Landing System, a special system that helps aircraft find their runway and land safely when there is low visibility and they cannot rely on vision alone.
The Instrument Landing System (ILS) is a radio navigation system that provides precision guidance to aircraft as they approach a runway. It has been used for nearly 100 years and is one of the few instrument approaches that can guide aircraft to the runway in near-zero visibility and low cloud ceilings. ILS uses a highly accurate radio signal and consists of several components, including the localizer antenna, which provides horizontal guidance and is positioned at the far end of the runway.
ILS critical area holding position signs, denoted by the letters "ILS", can be found on taxiways near critical areas, typically close to the runway threshold or glide slope transmitter. These signs indicate that all aircraft, people, and other obstructions must keep out of the area when a plane is using the ILS system. Pilots must adhere to these signs to ensure safety and avoid the risk of FAA filing a pilot deviation against them.
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Frequently asked questions
The numbers on airport runway signs refer to the runway. For example, if you see "9, 17, 27, 35", the sign is referring to a runway. The numbers show the runway's compass bearing, which is measured in tenths of a degree. So, if you're on runway 9, you're heading east (90 degrees on a compass).
Runways are designated numerically, while taxiways have alphabetic designations. So, "9, 17, 27, 35" refers to a runway, and "A, B, C, D, E" refers to a taxiway.
The colours on airport runway signs are standardised internationally by the International Civil Aviation Organization (ICAO) to enhance safety and efficiency. Red signs with white lettering indicate that a plane is headed towards the intersection of a runway, where another plane may be taking off. Yellow signs with black arrows provide directions to taxiways. Black signs with yellow letters indicate the plane's current position on the taxiway.
Runway holding position signs are placed on runways prior to the intersection with another runway. They are used when the runway is used for land and hold short operations or as a taxiway. At tower-controlled airports, pilots may only taxi past these signs once they have been cleared by the tower.
Runway distance remaining signs have a black background and white numbers. The numbers indicate the distance of the remaining runway in thousands of feet.
