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Air traffic control communications frequencies vary at airports. Airports with control towers usually have an assigned Unicom channel of 122.950. Airports without control towers use the Common Traffic Advisory Frequency (CTAF) or Unicom frequencies, with the most common being 122.7, 122.8, 122.9, 123.0, and 123.050 MHz. Ground frequencies are typically 121.3, 121.5, 121.7, and 121.9 MHz. Tower controllers instruct pilots to contact ground followed by an odd tenth number, such as point seven, indicating a frequency of 121.7 MHz. These frequencies are crucial for pilots to know, especially during takeoff and landing, to ensure safe aircraft movement at busy airports.
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What You'll Learn
To manage high aircraft traffic
Managing high aircraft traffic is a complex task that requires efficient coordination and communication. To ensure safe and orderly operations, airports utilize various frequencies for different purposes. These frequencies facilitate critical exchanges of information between air traffic controllers, pilots, and ground personnel.
One key frequency is the tower frequency, which is used by the local controller to manage aircraft in the immediate vicinity of the airport, typically within a radius of up to 3000 feet and 5 miles. This frequency is essential for providing crucial information to pilots during the approach, landing, and departure phases of flight, helping to maintain a safe distance between aircraft and ground vehicles.
To alleviate frequency congestion, especially at busy airports, multiple frequencies are employed. For instance, larger airlines often have dedicated dispatch frequencies to communicate with their dispatch staff and maintenance teams. Additionally, ramp frequencies are used at major airports to manage aircraft movement between the taxiway and the gate, reducing the workload on ground controllers and enhancing safety during the final stages of an aircraft's journey.
The use of multiple frequencies becomes particularly important in high-traffic scenarios. For example, at Seattle-Tacoma International Airport, which handles hundreds of landings daily, having separate ramp and ground frequencies ensures that each aspect of aircraft movement is carefully managed. This prevents delays and potential collisions, demonstrating the effectiveness of utilizing different frequencies to manage high aircraft traffic.
Furthermore, the Common Traffic Advisory Frequency (CTAF) or Unicom frequencies are commonly used at non-towered airports to facilitate pilot-to-pilot communications. These frequencies enable pilots to coordinate their actions effectively, especially during busy periods, contributing to the overall management of high aircraft traffic.
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To separate communications
To ensure effective communication and operational safety, airports use multiple frequencies for different purposes, known as "channels". These channels help separate communications and manage the high volume of air traffic.
One key channel is the "approach frequency" or "approach/departure", which assists aircraft in lining up for landing or taking off. This is crucial for safe and efficient operations, especially at busy airports with a high number of landings and take-offs, such as Seattle-Tacoma International Airport, which had an average of 24 landings per hour in June 2022.
Another important channel is the "tower frequency" or "local controller". Pilots use this frequency to obtain information about other aircraft in the airspace, enabling them to navigate safely and avoid potential collisions.
Once an aircraft has landed, the "ground frequency" comes into play. Ground controllers use this channel to guide aircraft to the appropriate taxiways and maintain safe distances between aircraft and ground vehicles.
Some large airports also have a "ramp frequency" to manage aircraft movement within the airport's premises, including taxiway-to-gate communications. This helps reduce congestion on other frequencies and enhances safety during critical ground operations.
Additionally, airports may have an "Automatic Terminal Information Service (ATIS)" channel, providing pilots with vital information such as weather conditions, equipment failures, closed runways, and special instructions.
These separate frequencies enable clear and focused communications, ensuring that different aspects of air traffic control can operate effectively without interfering with each other.
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To avoid frequency congestion
The use of different frequencies at airports is essential to avoid frequency congestion, especially in busy air traffic areas. This is because, at any given time, there are multiple aircraft attempting to land, taxi, or take off, and each of these aircraft needs to communicate with the airport's air traffic control (ATC).
For instance, a pilot will first communicate with the approach frequency controller to get permission to enter the controlled airspace. Once permission is granted, the pilot will then communicate with the tower frequency controller to receive information about other aircraft in the airspace. After touching down, the pilot will then communicate with the ground frequency controller, who will guide the aircraft to a taxiway and maintain a safe distance from other aircraft and ground vehicles.
The number of aircraft attempting to land, taxi, or take off at a busy airport can be significant. For example, Seattle-Tacoma International Airport had an average of 581 landings per day in June 2022, equivalent to 24 landings per hour. This high volume of aircraft traffic necessitates the use of different frequencies to avoid congestion and ensure effective communication between pilots and ATC.
To further alleviate frequency congestion, some airports implement ramp frequency, which is a local airport measure. Ramp frequency helps manage aircraft movement within the airport, specifically during the last yards from the taxiway to the gate. This reduces the workload on ground controllers, enhancing the safety and efficiency of aircraft movement on the ground.
Additionally, pilots can utilize dedicated Flight Service Station (FSS) frequencies, such as 122.2 MHz, to benefit from less congested communication channels. By directing their requests to the closest FSS, pilots can also ensure clearer communications and receive more specialized information about smaller airports, local procedures, and local weather patterns.
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To enable direct communication
The tower frequency, for instance, is used by the tower controller to manage aircraft in the immediate area around the airport. Pilots can receive information about other aircraft in the airspace, helping them to make a safe landing. Once an aircraft has landed, it is transferred to the ground frequency. Ground controllers then direct the aircraft to a taxiway and ensure a safe distance is maintained between aircraft and ground vehicles.
The use of different frequencies allows for clear and concise communication between pilots and air traffic control. This is essential for maintaining a safe and efficient flow of aircraft at busy airports. For example, Seattle-Tacoma International Airport had 17,456 landings in June 2022, averaging 24 landings per hour. With such a high volume of traffic, effective communication is critical.
Additionally, some frequencies are used for specific purposes. For instance, the Common Traffic Advisory Frequency (CTAF) or Unicom frequencies are used at non-towered airports. These frequencies allow pilots to communicate with each other and manage aircraft movement in the absence of a control tower.
Furthermore, larger airlines often have common frequencies used at multiple airports. These include dispatch frequencies, used to contact the airline's dispatch and maintenance staff, and load planning frequencies used at hub airports.
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To reduce the risk of miscommunication
For example, at controlled airports, ground frequencies are typically in the range of 121.3 to 121.9 MHz, with tower controllers using clipped communications to instruct pilots to "contact ground on point seven clearing the runway". This helps to ensure that pilots are on the correct frequency and are receiving the necessary instructions for takeoff or landing.
Additionally, larger airlines often have common frequencies used at multiple airports, such as dispatch frequencies for contacting dispatch staff and maintenance staff at the airline's headquarters. However, these common frequencies are less likely to be used in busier air traffic areas due to frequency congestion.
Airports with high aircraft traffic, such as Seattle-Tacoma International Airport, may also implement ramp frequencies to manage aircraft movement carefully and reduce the workload on ground controllers. This helps to ensure that critical communications are not missed due to frequency congestion.
Furthermore, pilots must be adept at using the correct frequencies at the correct time. Radios with flip-flop frequencies are useful in this regard, as they allow pilots to quickly return to the previous frequency if communications cannot be established on a new one. Experienced pilots will also proactively tune into the next expected frequency before being instructed to switch.
By utilizing different frequencies for specific purposes and maintaining effective frequency management, the risk of miscommunication in aviation is significantly reduced, contributing to safer and more efficient air travel.
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Frequently asked questions
Airport tower frequencies are not always lower. The frequencies used depend on the airport and the aircraft density in the area.
Some common frequencies used at airports include:
- 122.7 MHz, 122.8 MHz, 122.9 MHz, 123.0 MHz, 123.05 MHz, and 123.07 MHz at non-towered airports.
- 121.3 MHz, 121.5 MHz, 121.7 MHz, and 121.9 MHz at controlled airports.
- 122.95 MHz for airports with a tower.
- 123.025 MHz in urban areas for air-to-air traffic advisory.
Other frequencies used in aviation include:
- 121.1-121.9 MHz for US aviation.
- 122.0 MHz for weather information.
- 108.0-117.975 MHz for VOR frequencies.
Different frequencies at airports are used to facilitate various operations and ensure efficient communication. For example, the tower frequency is used for aircraft in the immediate area around the airport, while the ground frequency is used to manage aircraft movement on the taxiways and maintain proper distance between aircraft and ground vehicles.
Pilots use aeronautical charts, radio references, and their knowledge of common aviation frequencies to determine the correct frequency to use. They also receive instructions from air traffic controllers, who guide them through the different frequencies as they approach and depart from an airport.
