Noise

Noise monitored round the clock

Aircraft noise is a huge environmental challenge for any airport, as well as the greatest environmental concern, naturally, of the people living near the airport. CPH monitors noise from all flight operations round the clock.

A large number of noise abatement measures have been implemented. They include operating restrictions on the use of the runway system, night-time noise restrictions for individual aircraft operations, requirements to the operation of aircraft during taxi and other restrictions.

Noise monitoring system
The noise monitoring system forms the basis for the collection of noise data also used for continuous monitoring of the airport’s noise impact on the areas around the airport. Moreover, the noise data recorded are used to report every violation to the restrictions to the environmental and aviation authorities, to prepare the airport’s self-regulation reports, and in connection with complaints.

Strict noise-reduction requirements
To reduce the noise exposure as much as possible, the environmental and aviation authorities have imposed a number of noise restrictions on the airport:

  • employ a noise monitoring system;     
  • remain under a total annual noise impact level;  
  • remain under a maximum night-period noise level at night;  
  • remain under a maximum level for taxiing noise at night;  
  • observe certain requirements with respect to reversing in connection with landings;  
  • ensure aircraft remain within fixed approach and departure corridors;  
  • observe certain requirements with respect to runway use;  
  • observe certain requirements with respect to engine run-ups;
  • and observe certain requirements with respect to the use of APUs.

Night-time noise level restrictions
Aircraft noise at night and during the early hours of the morning may cause sleep disruption and is often perceived as a particular nuisance. Arrivals and departures during night-time (11 pm to 6 am) are therefore restricted to a maximum A-weighted noise level of 80 dB at six measuring points located in the residential areas. (see the section on runway use).

With the 80 dB(A) noise limit the Environmental Protection Agency  wishes to ensure that aircraft noise does not cause sleep disruption for people living near the airport. In its evaluation, the Agency includes a certain assumed level of noise reduction provided by the average Danish home. All measured maximum noise levels exceeding the limit are reported to the authorities.

Aircraft taxiing on taxiways and runways are also subject to night time noise restrictions.  

Use of reverse thrust in connection with landings
During landing aircraft often use reverse thrust to reduce speed. Jet engines have a kind of “shield” which can be activated to send the jet stream forward and this helps reduce speed. This causes a good deal of noise, especially with older aircraft types, therefore aircraft are only allowed to use reverse thrust above idle for safety reasons.

Read more

Noise sources
Take-offs and landings are the main – but not the only – source of noise (read more)

Noise impact
Significant noise reduction in spite of increase in passenger numbers (read more)

Flight operations - WebTrak
Follow flight operations with WebTrak (read more)

Use of APU's
Most jet aircraft have an APU (auxiliary power unit), a small jet engine which produces power for the aircraft when it is on the ground and the main engines are turned off. (read more)

Engine run-ups
In connection with repair and maintenance of aircraft, the engines are tested. Testing of aircraft engines on the ground may produce noise that can be a nuisance to the airport’s neighbours.(read more)