Informations aux riverains

French law dated 6 March 2009 defines how measures designed to cut noise pollution are applied at Bordeaux Aerodrome. The French South-West Civil Aviation Authority’s safety department is able to make a statement attesting to any failures to adhere to regulations. If this statement is supported by evidence, the airline could face financial penalties. This penalty is levied by the French Airport Noise Inspection Authority (or Autorité de Contrôle des Nuisances Aéroportuaires). For the purposes of transparency, information about any fines levied is available to the public.

A “go around” is the term used to describe a controlled safety manoeuvre used by pilots when they judge that the conditions are not right for landing. This procedure allows the plane to regain height, so that it can then attempt to land again. There are several reasons why a pilot might opt for a go around: 

• The plane might be travelling too fast or too high in the air, or it might not be stable enough; 
• The weather conditions could be poor; 
• There might be something on the runway, such as another aircraft or an animal.

The noise an aircraft makes mainly depends on what type of plane it is and the engine it uses; whether it is taking off or landing; how far away it is; and weather conditions (such as wind force and direction, temperature, humidity levels and atmospheric pressure). How noisy a plane seems depends on the individual listener, how susceptible they are to hearing it as it goes over, and other sounds around them. As a result, in a single location planes might seem noisier to you some days than others, depending on the type of aircraft in operation, whether it’s landing or taking off, the runway being used, weather conditions and what you’re doing at that moment.

Planes usually travel into the wind when they take off or land. This way, they are quicker to reach the speed they need to take off, and they have more lift. Landing into the wind helps them gradually put on the brakes and reduces the distance they then travel on the runway. This is why runways can be used both ways in a single day – it all depends on the direction and speed of the wind, both on the ground and at altitude. Air traffic control decides which runway should be used and the direction a plane needs to travel in.

There are various factors that affect the slightly different paths planes take when they arrive at or depart from the airport:

• Weather conditions: wind direction and force, atmospheric pressure and other conditions have a direct influence on planes’ trajectories and the time it takes them to get into the air. 
• The aircraft type, and the size of its load: depending on how much they are carrying, two identical planes with identical engines will take different lengths of time to get in the air. Even if they have travelled the same distance from the runways, they won’t both reach the height they need to cruise towards their destination at the same time. 
• Aircraft speed: speed has a direct influence on the curving path a plane takes as it travels through the air. This is why two aircraft with different speeds that start climbing at the same point will follow different trajectories.
• Air traffic safety: to keep aircraft safe, they need to maintain a minimum distance from each other, horizontally and vertically. Airways and published flight paths take into account instruments’ and equipment’s levels of precision when they set out the range of space that aircraft can occupy (planes don’t follow strict lines like trains on a railway track).
• The air navigation procedure used for approaches and departures.