Jazmin Li
Airports are classified as Class B when they are particularly busy, with lots of fast-moving aircraft. Class B airspace is designed in layers, like an upside-down wedding cake, with the central core extending up to 10,000 feet. The airspace is busy and congested, and pilots must adhere to strict rules and regulations. To enter Class B airspace, pilots must have a two-way radio, Mode-C or Mode-S transponder, and ADS-B out onboard their aircraft.
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What You'll Learn
Class B airports are busy and congested
Bravo airspace is almost always busy, but certain times of the day can be particularly hectic. This is called a 'push'. ATC will likely refuse VFR Bravo clearances during a push. Pilots must remain outside Bravo airspace and wait for further clearance. Once inside the Bravo airspace, pilots are responsible for maintaining situational awareness, ATC communication, and adhering to airspace rules.
The airspace is designed in layers, with the central core extending up to around 10,000 feet MSL. Two or more additional layers, or shelves, cover arrival and departure routes. The shelves extend outwards from the core, with each shelf's base altitude increasing as you move away from the airport. This design is often referred to as an ""upside-down wedding cake", with the primary Class B airport at the centre.
Class B airspace has some of the most restrictive equipment and communication requirements. All aircraft must be equipped with a two-way radio, Mode-C or Mode-S transponder, and ADS-B Out to enter the airspace. This allows pilots to maintain communication with ATC, who can track their location, altitude, speed, and heading.
Due to the busy and congested nature of Class B airspace, it is not an ideal learning environment for new pilots. Student pilots without a private pilot certificate are typically not allowed to fly in Class B airspace without prior approval. Even with special endorsements, some of the busiest Class B airports, like Atlanta, JFK, and Los Angeles, are off-limits to students due to safety concerns.
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Class B airspace is designed like an upside-down wedding cake
The design of Class B airspace is often likened to an upside-down wedding cake. This design is used to protect air traffic and instrument procedures, with the airspace near an airport covered to protect descending and climbing aircraft. The "wedding cake" shape is circular and stepped, with each layer progressively getting wider the higher up from the surface, allowing air traffic to safely operate independently underneath.
Class B airspace surrounds the busiest airports in the country, with multiple tiers and shelves that spread outwards. Each Class B airport's airspace is unique, with experts deciding on the number and placement of layers to protect arrivals and departures while keeping airspace free and open. The "wedding cake" shape also helps to cover the descending and climbing paths of aircraft without covering low-lying areas that are not needed.
The base altitude or "floor" of each shelf increases as you move outwards from the airport, while the ceiling remains the same. This creates the "upside-down wedding cake" shape, with the primary Class B airport at the surface and centre of the "cake". The vertical and lateral limits of Class B airspace are designed to contain all instrument procedures at the primary airport within the airspace.
The Federal Aviation Administration (FAA) tailors each Class B airspace to ensure safe traffic flow in and out of the airport while minimising impact on nearby satellite airports. The design of Class B airspace should be as simple as practical, with the number of sub-areas kept to a minimum. The "wedding cake" shape helps achieve this simplicity while effectively managing air traffic in and out of the airport.
Class B airspace is carefully designed and regulated to ensure the safe and efficient flow of air traffic in and out of busy airports. The "upside-down wedding cake" design is an effective way to visualise and manage the complex airspace around these airports, allowing for the safe and orderly movement of aircraft.
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Class B airports have ground and tower control
Class B airports are among the busiest airports in the United States, with 37 such airports in the country as of January 2023. The airspace around these airports is classified as ICAO Class B, and the primary airport for which this airspace is designated is called a Class B airport.
Class B airspace is designed to have multiple layers or shelves that cover arrival and departure routes. These layers start at the surface and progressively get wider the higher up you go, resembling an upside-down wedding cake. The airspace is designed this way to protect arrivals and departures at the busy airport while keeping as much airspace free as possible to avoid encroaching on other airports.
To enter Class B airspace, aircraft must meet specific requirements, including having a two-way radio, Mode-C or Mode-S transponder, and ADS-B Out equipment on board. Aircraft must also be equipped with a radar beacon transponder that supplies automatic altitude reporting. Class B airspace has some of the most restrictive equipment and communication requirements, but it offers more flexibility in weather conditions since air traffic controllers can closely track VFR aircraft's altitude, speed, and heading.
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Class B airspace has relaxed weather requirements
Class B airports are among the busiest airports in a region. They are characterised by high traffic and strict equipment and communication requirements. Class B airspace has a distinctive ""upside-down wedding cake" shape, with three layers or shelves that start at the surface and progressively widen upwards. Each layer has a higher base altitude or floor as you move outwards from the airport. The airspace is tailored to ensure safe traffic flow in and out of the airport and to minimise impact on nearby satellite airports.
Class B airspace has some of the most relaxed weather requirements compared to other classes. This is because air traffic controllers (ATCs) closely monitor the altitude, speed, and heading of all Visual Flight Rules (VFR) aircraft within this airspace. Due to this tight control, pilots can be permitted to fly in less favourable weather conditions while still being able to "see and avoid" other aircraft. The weather requirements for Class B airspace are simple: 3 statute miles (SM) visibility and clear of clouds.
To enter Class B airspace, pilots must adhere to specific equipment and communication protocols. They need a two-way radio, a Mode-C or Mode-S transponder, and ADS-B Out equipment onboard their aircraft. The Mode-C transponder is required within 30 nautical miles of a Class B airport, regardless of altitude. Additionally, aircraft must be equipped with a radar beacon transponder for automatic altitude reporting.
It is important to note that Class B airspace is not an ideal training environment for new pilots due to its congested nature. Student pilots without a private pilot certificate are generally not permitted to fly in this airspace without prior approval. Even with special endorsements, some of the busiest Class B airports may be off-limits due to safety concerns.
When approaching a Class B airport, pilots should expect busy frequencies and faster-moving aircraft. They should maintain their speed and be prepared for either a long or short approach to landing. Communication with ATC is crucial, and pilots should request clearance before entering the airspace. Once inside, pilots must strictly adhere to situational awareness, maintain ATC communication, and follow airspace rules as there is no room for error.
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Class B airspace has restrictive equipment and communication requirements
Class B airports are among the busiest airports in a region, with congested and busy airspace. The airspace is designed in layers, often described as an upside-down wedding cake, with each layer starting at a higher altitude as you move outwards from the airport. The airspace is tailored to ensure the safe flow of traffic in and out of the airport and to minimise the impact on nearby satellite airports.
Visual Flight Rules (VFR) aircraft must receive clearance from approach control before entering Class B airspace. Due to the busy nature of Class B airspace, VFR clearances may be refused during peak times, and VFR aircraft may be asked to remain outside the airspace until further clearance is granted. Once inside the Bravo airspace, pilots are responsible for maintaining situational awareness, adhering to ATC communication, and following airspace rules.
Additionally, student pilots without a private pilot certificate are typically not allowed to fly in Class B airspace without prior approval due to safety concerns. Special training and endorsements may be required for student pilots to conduct solo flights into these airspaces.
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Frequently asked questions
Class B airports are some of the busiest airports in a region. They have a distinctive upside-down wedding cake shape, with three layers that progressively get wider the higher up you go.
Class B airspace is busy and congested. It is tailored by the Federal Aviation Administration (FAA) to ensure traffic flows in and out of the airport safely. It has a unique shape for each airport, with the layers starting and ending along identifiable landmarks.
To enter Class B airspace, you need a two-way radio, Mode-C or Mode-S transponder, and ADS-B Out onboard your aircraft. You must also receive clearance from approach control.
Flying into a Class B airport can be hectic, so it is important to maintain your speed and anticipate a long or short approach to landing. You will also need to pay landing and parking fees, which are usually calculated based on the size or type of your aircraft, arrival time, and length of stay.
As of January 2023, there are 37 Class B airports in the United States. Examples include Atlanta, JFK, Chicago O'Hare, and Los Angeles.
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