Sachin Walls
Aircraft noise is a significant concern for people living near airports. While the aviation industry has made significant progress in reducing noise over the decades, with modern jet aircraft being roughly 75% quieter than the first models, there is still work to be done. Strategies to reduce aircraft noise include optimizing aircraft type, regulating night flights, modifying operating runways, implementing land-use planning, and installing sound insulation. Additionally, advancements in technology, such as the introduction of high-bypass ratio turbofans, have contributed to noise reduction. A balanced approach to noise reduction, community engagement, and investment in environmentally compatible technologies are crucial for minimizing the impact of aircraft noise on local communities.
Strategies to reduce noise in airports
| Characteristics | Values |
|---|---|
| Aircraft type optimisation | Replacing noisy aircraft with low-noise aircraft |
| Number of night flights | Reducing the number of night flights |
| Flight procedure optimisation | Reduced thrust take-off, displaced landing thresholds, continuous descent operations |
| Operating runway modification | Using runways that go over seas or lakes |
| Land use planning | Implementing zoning rules, discouraging residential development, encouraging light industry or storage areas |
| Sound insulation | Installing sound insulation windows, insulating homes and schools |
| Track concentration | Air traffic management mapping out flight tracks that avoid densely populated areas |
| Track dispersion | Aircraft following designated tracks |
| Navigation performance | Performance-Based Navigation (PBN) |
| Community engagement | Fair distribution of noise, local control of airports |
| Environmental and health protection | Enforcing Clean Air and Clean Water regulations, adopting new regulations addressing health and environmental impacts |
| Global Nighttime Curfew | Implementing a nationwide and global curfew |
| Aviation industry and government | Choosing between shortening routes and reducing noise |
| Investment in technology | Sharp investment increases in environmentally compatible technologies |
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What You'll Learn
Optimise aircraft type
Optimising aircraft type is a key strategy in reducing noise pollution in airports. Aircraft noise is generated by various sources, including engines, propellers, rotors, airframes, and landing gear. The type and size of the aircraft, flight phase, weather conditions, and distance from the observer all influence the amount of noise produced.
One effective way to optimise aircraft type is to replace older, noisier models with newer, quieter ones. For example, replacing the B737-800 with the A320-232 or B787-8R can significantly improve the acoustic conditions at an airport. The latest large aircraft, such as the Boeing 787, Airbus A350, and A380, have remarkably small noise "footprints". The A220, for instance, utilises Pratt & Whitney 'geared' turbofan engines, which help to further reduce noise and emissions.
Additionally, aircraft manufacturers like Airbus are continuously working to improve airframe design and engine technologies to minimise noise levels. Their latest generation of aircraft complies with the most stringent international noise standards set by the International Civil Aviation Organization (ICAO). This includes the A321neo, which produces 50% less noise during takeoff than its predecessor, the A321ceo.
Another strategy to optimise aircraft type is to implement noise abatement procedures. These procedures provide specific instructions to pilots, air traffic controllers, and airport operators on how to optimise the flight profile, speed, thrust, altitude, and direction of aircraft to minimise noise levels. For instance, the Continuous Descent Approach (CDA) procedure involves reducing engine thrust after takeoff to the minimum required for safety while maintaining a steep climb angle.
By combining the replacement of older aircraft models with newer, quieter ones and implementing noise abatement procedures, airports can effectively optimise aircraft type to reduce noise pollution in the surrounding communities.
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Reduce night flights
Reducing the number of night flights is one of the most effective ways to reduce noise pollution in the local area and for the population surrounding an airport. This strategy has been proven to reduce the overall noise-exposed area and population.
For example, a study on noise reduction strategies for Guangzhou Baiyun International Airport (BIA) in China proposed six aircraft noise reduction strategies, including the regulation of night flight numbers. The study found that each proposed strategy has its own advantages and can serve as an effective noise reduction measure for different applications.
Another study, which investigated the influence of night flights on the airport's overall noise levels, found that the number of night flights had a significant impact. By reducing the number of flights during the night, the airport can decrease the number of people exposed to high noise levels.
To implement this strategy, airports can work with air navigation service providers and operators to map out flight tracks that avoid populated areas. This can be done in consultation with community groups to ensure that flight tracks do not fly over residential areas, reducing the impact of noise on local residents.
In addition to reducing night flights, other strategies to minimize noise pollution include optimizing aircraft type, modifying operating runways, implementing land-use planning, and installing sound insulation windows.
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Optimise flight procedures
Optimising flight procedures is a key strategy in reducing noise pollution from airports. This involves implementing noise abatement procedures, which include restrictions on runway usage, optimised flight paths, and descent profiles. By adhering to these procedures, aircraft operations can minimise their impact on nearby communities in terms of noise pollution.
One way to optimise flight procedures is to utilise advanced flight guidance technologies, such as Area Navigation (RNAV) with the Global Positioning System (GPS). This enables more flexible approach and departure procedures, reducing noise exposure to sensitive areas. For example, at Boston Logan Airport, the implementation of RNAV procedures between 2012 and 2013 allowed for more efficient and predictable aircraft navigation. However, it also resulted in a concentration of aircraft trajectories over specific neighbourhoods, leading to increased noise complaints. To address this, the Federal Aviation Administration (FAA), Massport, and MIT collaborated to identify modifications to departure and arrival procedures, resulting in the submission of four new low-noise flight procedures.
Another strategy is to optimise the takeoff and landing tracks of runways to avoid densely populated areas. For instance, at Guangzhou Baiyun International Airport (BIA) in China, the optimisation of the takeoff track of runway 02L/20R reduced the population affected by aircraft noise. Additionally, airports can designate a preferred runway for takeoff and landing, ensuring that flights operate over less populated areas.
Furthermore, advancements in aircraft navigation technology have enabled more precise flight tracks, allowing noise abatement offices to minimise the impact of aircraft noise on surrounding communities. Aircraft can also try to fly over water, highways, and less populated areas as much as practical to reduce noise exposure for residents.
Finally, continuous research and development in the aviation industry aim to further reduce airport noise. This includes the development of quieter aircraft engines, noise-reducing airframe designs, and advanced air traffic management systems. For example, the latest large aircraft, such as the Boeing 787 and Airbus A350, have significantly reduced noise 'footprints'.
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Modify operating runways
Modifying the operating runways is a key strategy in reducing aircraft noise and its impact on the local area and population. This strategy has been proposed for Guangzhou Baiyun International Airport (BIA) in China, which is the busiest airport in the world in terms of air passenger traffic.
One way to modify operating runways is to regulate the operating scheme of the runways. This involves changing the runways used for takeoff and landing to reduce the noise impact on the surrounding areas. For example, by using Runway 20L/02R at BIA for landing only, the noise exposure to the nearby population can be reduced.
Another strategy is to implement noise reduction procedures in consultation with air navigation service providers and airport operators. This includes procedures such as reduced thrust take-off, displaced landing thresholds, and continuous descent operations. By following these procedures, aircraft can reduce their noise impact, especially during take-off and landing.
In addition, the placement and use of runways are crucial. Airports can direct planes travelling at night over seas or lakes to minimise noise disturbance. Air traffic management can also play a role by mapping out flight tracks that avoid densely populated areas. With recent advancements in navigation performance, aircraft can now follow precise designated tracks, reducing the number of residents subjected to flyovers.
Furthermore, modifying the operating runways can be combined with other strategies such as optimising aircraft types, regulating night flight numbers, optimising flight procedures, land-use planning, and installing sound insulation windows. By integrating these approaches, airports can effectively reduce noise levels and minimise the impact on the surrounding communities.
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Land-use planning
Zoning and Development Control: Airports and local authorities should work together to establish zoning regulations that discourage or prevent new noise-sensitive developments, such as residential, healthcare, or educational facilities, from being built in areas prone to high aircraft noise levels. Instead, these areas can be designated for developments that are less sensitive to noise, such as light industrial or storage facilities.
Noise Mapping and Flight Path Planning: By utilising noise mapping techniques, airports can identify areas with high noise levels during take-off and landing. This information can then be used to adjust flight paths, ensuring they avoid densely populated areas. Modern navigation technologies, such as Performance-Based Navigation (PBN), enable aircraft to follow precise 3D flight paths, minimising the number of people exposed to aircraft noise.
Sound Insulation and Ventilation: In some cases, new or existing homes in the vicinity of airports may require sound insulation and proper ventilation to reduce indoor noise levels. Governments have often provided funding for such insulation, recognising its importance in mitigating the impact of aircraft noise on nearby residents.
Long-Term Planning: Governments and airport operators are encouraged to adopt a proactive, long-term approach to land-use planning. This ensures that future developments around airports are carefully considered, and any potential negative impacts of aircraft noise are minimised.
Community Engagement: Land-use planning should also involve community engagement and consultation with local community groups. By considering the perspectives and needs of those living near airports, a balanced approach to noise reduction can be achieved, taking into account factors such as track concentration versus track dispersion.
By implementing these land-use planning strategies, airports and local authorities can effectively reduce noise pollution, improve the acoustic environment for surrounding communities, and foster a more harmonious relationship between aviation hubs and their neighbouring regions.
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Frequently asked questions
Airports can reduce noise pollution by implementing noise reduction strategies such as:
- Optimizing aircraft type
- Regulating the number of night flights
- Optimizing flight procedures
- Modifying the operating runway
- Implementing land use planning
- Installing sound insulation windows
Some long-term strategies for reducing airport noise include:
- Increasing investment in environmentally compatible technologies and strategies
- Working with local authorities to implement zoning rules and discourage new residential developments in areas affected by airport noise
- Implementing a balanced approach to aircraft noise management, including community engagement and source noise reduction
Some immediate actions that can be taken to reduce airport noise include:
- Implementing performance-based navigation (PBN) to create precise 3-D flight paths that minimize population impact
- Using air traffic management to map out flight tracks that avoid densely populated areas
- Implementing noise reduction procedures such as reduced thrust take-off and continuous descent operations
