Ruth Haines
Airport diagrams are published by the Federal Aviation Administration (FAA) and are used by pilots to navigate taxiways and runways, especially when visiting a new airport. They are also used to identify potential risks and hazards. The diagrams follow a standard format, with the airport name and its International Civil Aviation Organization (ICAO) identifier, as well as effective dates, usually located on the left and right sides, indicating when the diagram is accurate and current. The diagrams also include details such as runway length, width, and slope, as well as the elevation of each threshold, which is marked at the end of each runway. Aeronautical charts and publications are updated frequently, so pilots must check the effective dates and discard outdated materials to avoid safety risks.
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What You'll Learn
Understanding the format
Airport diagrams are published by the Federal Aviation Administration (FAA) and follow a common format. The margin of the diagram, or the area surrounding it, contains important information that provides relevance and accuracy. The top and bottom of the diagram contain the date of the latest revision, the type of chart, the name of the airport, and its identifier. The date of the latest revision represents the day of the last amendment to the chart. The enlarged text "airport diagram" helps the pilot identify what the chart contains, especially when managing several reference charts. The right corner of the chart contains the name of the airport and its International Civil Aviation Organization (ICAO) identifier. On the left and right sides of the airport diagram, there is an effective date range, indicating when the chart is accurate and current. Pilots should always refer to the latest editions of aeronautical charts and publications, discarding obsolete materials.
The FAA defines a "hot spot" as a location with a history or potential risk of collision or runway incursion, requiring heightened attention from pilots and drivers. These are charted on airport diagrams but lack signage on taxiways. Decision Height (DH) or Minimum Descent Height (MDH) are also indicated on airport diagrams, referring to the height above the Touchdown Zone (TDZ). The Height Above Airport (HAA) is used for circling approaches, indicating the height between the MDH and the Airport Reference Point (ARP). The ARP is the latitude/longitude position of the airport and is used as a waypoint in GPS navigators.
Runways are labelled with numbers and letters, such as "Runway 3L/21R", indicating their magnetic heading. For example, the exact magnetic heading of Runway 3L is 30.8°, while Runway 21R has a heading of 210.8°. The elevation of each threshold is depicted at the end of each runway, along with any slope. The weight-bearing capacity of each runway is also indicated through codes based on the landing configuration of the aircraft. For example, "D" represents a double or dual weight capacity.
Airport diagrams also include information on taxiways and other relevant details. For instance, the presence of an EMAS (Engineered Materials Arresting System) indicates that aircraft may need assistance in stopping, especially if they go beyond the runway. Additionally, diagrams can help identify FBO (Fixed-Base Operator) locations, which are important for pilots to know when turning onto a taxiway.
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Runway information
Runway Identification and Designation:
Runways are typically identified by their numerical designations, such as "9, 17, 27, 35," etc. This numerical naming convention helps distinguish runways from taxiways, which are designated alphabetically.
Runway Dimensions:
Airport diagrams provide essential dimensions for runways, including their length and width. For example, a runway may be specified as having a length of 4846 feet and a width of 60 feet. This information is vital for pilots to understand the available space for takeoff and landing.
Runway Gradient and Elevation:
The diagrams also indicate the gradient and elevation of runways. The gradient may be represented as a percentage, such as an upslope of 0.8% or a downslope when using the reciprocal. Additionally, the elevation of each threshold is depicted at the end of each runway.
Runway Weight-Bearing Capacity:
The weight-bearing capacity of runways is crucial for aircraft landing. Codes on the diagrams, such as "S" for single-wheel bogies and "D" for single-axle, two-wheel bogies, indicate the maximum permissible weights in thousands of pounds for different landing gear configurations.
Runway Direction and Magnetic Heading:
Airport diagrams illustrate the direction and magnetic heading of runways. For instance, a runway may have a magnetic heading of 30.8° for one direction and 210.8° for the reciprocal direction.
Runway Hot Spots and Safety:
Airport diagrams also identify "Runway Surface Hot Spots" or "Airport Surface Hot Spots." These are areas with a history or potential risk of collision, runway incursion, or other incidents. Circles or ellipses on the diagram denote ground movement hotspots that have caused issues like hold short line infractions, approach hold issues, or complex taxiway problems.
By understanding and applying the information presented in airport diagrams, pilots can effectively navigate runways and ensure safe ground operations at airports.
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Taxiway navigation
Understanding Taxiway Signage:
Taxiways are marked with a combination of letters and numbers or letters alone. These identifiers are indicated on signs, which can be black with yellow letters or yellow with black letters and arrows. For example, you might see "SG6" marking a taxiway. These signs provide crucial information on your location and the direction to various taxiways.
Pre-Flight Preparation:
Before taking off, it is essential to study the airport diagram of your departure airport. Identify the expected runway and familiarize yourself with the route from your starting point to the runway. Note any intersections or areas where you might need to cross runways, as these can be potentially confusing or unsafe, often labelled as "hot spots".
In-Cockpit Navigation:
During taxiing, keep the airport diagram readily available for reference. Utilize geo-referenced maps or GPS navigators that display the airport layout, including runways and taxiways, along with your real-time position. Pay close attention to air traffic control (ATC) instructions, especially hold-short instructions, to prevent conflicts with other aircraft or vehicles.
Progressive Taxi Instructions:
If you're unfamiliar with the airport or facing challenging conditions, such as inclement weather or low visibility, consider requesting progressive taxi instructions. Ground controllers at tower-controlled airports are usually happy to provide progressive taxiing, guiding you through turns and routes to the ramp or runway.
Vigilance and Communication:
Always maintain vigilance and be prepared to stop and radio for clarification if you have any doubts about your location or the expected route. Additionally, effective in-cockpit communication is crucial. If you cannot accept certain instructions, such as hold-short instructions, be sure to advise ATC so they can coordinate traffic accordingly.
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Aeronautical information
The margin of an airport diagram contains important information, including the date of the latest revision, the type of chart, the name of the airport, and its identifier. The date of the latest revision is given in the Julian date format, with the first two digits indicating the year, and the last three digits indicating the day of the year. The enlarged text "airport diagram" in the centre of the chart helps the pilot identify what type of chart they are looking at. The name of the airport and its International Civil Aviation Organization (ICAO) identifier are also included, usually in the right corner of the chart. The effective date of the chart, i.e., when it is current, is given on the left and right sides of the diagram.
Airport diagrams are useful tools that help pilots navigate the taxiways and runways to get to the required area, even if it is their first time at the airport. They also help pilots understand what runway to use and the route to take when navigating the airport. For example, the diagram will indicate whether the runway is suitable for LAHSO (Land and Hold Short Operations). The diagram will also show the length, width, and slope of the runway, as well as the exact magnetic heading and the elevation of each threshold. The weight-bearing capacity of each runway is also indicated, with codes based on the landing configuration of the aircraft.
Pilots can refer to the Aeronautical Chart Users' Guide and YouTube tutorials to help them understand the symbology used on airport diagrams.
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Hot spots and safety
Airport diagrams are crucial tools that help pilots navigate taxiways and runways, even if they are visiting a particular airport for the first time. These diagrams are published by the Federal Aviation Administration (FAA) and adhere to a uniform format. They contain vital information that aids pilots in determining the runway to use and the route to follow when navigating an airport.
Hot spots, as defined by the FAA, are areas on an airport's movement area that have a history or potential risk of collision or runway incursion. These locations demand heightened vigilance from pilots and drivers to ensure safe operations. For instance, Reading has four hot spots, with three of them in close proximity. It is important to note that while these hot spots are indicated on airport diagrams, there is no signage on the taxiways to indicate their presence. As a result, pilots need to be extra cautious, especially during night-time operations.
To ensure safety, pilots should always refer to the latest editions of aeronautical charts and publications, discarding outdated materials. The effective dates on these charts and publications are crucial for verifying their currency. Additionally, pilots should consult the Notice to Air Missions Publication (NOTAM) for crucial updates between chart and publication cycles. This publication is issued every 28 days by the FAA and can be obtained through subscription from the Government Printing Office.
Furthermore, pilots can benefit from studying the airport diagram to identify Fixed-Base Operator (FBO) locations. For instance, at Reading Regional Airport, knowing the FBO location helps pilots determine whether to turn left or right onto a taxiway after landing on Runway 13. While ground control will provide redirection if needed, having this information beforehand contributes to a smoother and safer operation.
When studying airport diagrams, pilots should also pay attention to the runway details. For example, the presence of an EMAS (Engineered Materials Arresting System) at Reading Regional Airport indicates that aircraft may require assistance in stopping if they exceed the runway during landing or takeoff. This information is crucial for safety, as it helps pilots avoid potential hazards beyond the runway, such as roads, trees, or bodies of water.
Additionally, pilots can refer to various resources to enhance their understanding of airport diagrams and improve their navigational skills. These resources include the Aeronautical Chart Users' Guide, which provides definitions of airspace terms and explanations for colored circles and shapes on VFR charts. The guide also offers legend references and serves as a learning aid for new pilots and a quick reference for experienced pilots.
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Frequently asked questions
Airport diagrams are tools that pilots use to navigate the taxiways and runways to get to the required area. They are published by the Federal Aviation Administration (FAA) and follow a common format.
An airport diagram contains information about the runways and taxiways of an airport. This includes the runway's length, width, slope, and magnetic heading. It also includes information about the airport's location, such as the airport's name, its International Civil Aviation Organization (ICAO) identifier, and the effective date of the diagram.
Airport diagrams allow pilots to be less task-saturated and have better situational awareness for safer operations. They can also be used to identify potential risks, such as hot spots, and to plan for specific operations, such as Land and Hold Short Operations (LAHSO).
Airport diagrams can be found on the Federal Aviation Administration's (FAA) website or through authorized publishers. They are also available in hard copy format from the Government Printing Office.
To read an airport diagram, first understand airspace definitions and download a VFR sectional chart that includes your home airport. Then, study the symbology around your airport using the Aeronautical Chart Users Guide. Additionally, online platforms such as YouTube offer a plethora of resources and instructional videos on reading airport diagrams.
