- Latest available (Revised)
- Point in Time (31/01/2020)
- Original (As adopted by EU)
Commission Directive (EU) 2015/996 of 19 May 2015 establishing common noise assessment methods according to Directive 2002/49/EC of the European Parliament and of the Council (Text with EEA relevance)
When the UK left the EU, legislation.gov.uk published EU legislation that had been published by the EU up to IP completion day (31 December 2020 11.00 p.m.). On legislation.gov.uk, these items of legislation are kept up-to-date with any amendments made by the UK since then.
Legislation.gov.uk publishes the UK version. EUR-Lex publishes the EU version. The EU Exit Web Archive holds a snapshot of EUR-Lex’s version from IP completion day (31 December 2020 11.00 p.m.).
EU Directives are published on this site to aid cross referencing from UK legislation. Since IP completion day (31 December 2020 11.00 p.m.) no amendments have been applied to this version.
The noise level contributions from each segment of the flight path are derived from the NPD-data stored in the international ANP database. However it must be noted that these data have been normalised using average atmospheric attenuation rates defined in SAE AIR-1845. Those rates are averages of values determined during aircraft noise certification testing in Europe and the USA. The wide variation of atmospheric conditions (temperature and relative humidity) in those tests is shown in Figure D-1.
The curves overlaid on Figure D-1, calculated using an industry standard atmospheric attenuation model ARP 866A, illustrate that across the test conditions a substantial variation of high frequency (8 kHz) sound absorption would be expected (although the variation of overall absorption would be rather less).
Because the attenuation rates, given in Table D-1, are arithmetic averages, the complete set cannot be associated with a single reference atmosphere (i.e. with specific values of temperature and relative humidity). They can only thought of as properties of a purely notional atmosphere — referred to as the ‘AIR-1845 atmosphere’.
Average atmospheric attenuation rates used to normalise NPD data in the ANP database
Centre frequency of 1/3-octave band [Hz] | Attenuation rate [dB/100 m] | Centre frequency of 1/3-octave band [Hz] | Attenuation rate [dB/100 m] |
---|---|---|---|
50 | 0,033 | 800 | 0,459 |
63 | 0,033 | 1 000 | 0,590 |
80 | 0,033 | 1 250 | 0,754 |
100 | 0,066 | 1 600 | 0,983 |
125 | 0,066 | 2 000 | 1,311 |
160 | 0,098 | 2 500 | 1,705 |
200 | 0,131 | 3 150 | 2,295 |
250 | 0,131 | 4 000 | 3,115 |
315 | 0,197 | 5 000 | 3,607 |
400 | 0,230 | 6 300 | 5,246 |
500 | 0,295 | 8 000 | 7,213 |
630 | 0,361 | 10 000 | 9,836 |
The attenuation coefficients in Table D-1 may be assumed valid over reasonable ranges of temperature and humidity. However, to check whether adjustments may be necessary, ARP-866A should be used to calculate average atmospheric absorption coefficients for the average airport temperature T and relative humidity RH. Where, from a comparison of these with those in Table D-1, it is judged that adjustment is required the following methodology should be used.
The ANP database provides the following NPD data for each power setting:
maximum sound level versus slant distance, Lmax(d)
time integrated level versus distance for the reference airspeed, LE(d), and
unweighted reference sound spectrum at a slant distance of 305 m (1 000 ft), Ln,ref(dref) where n = frequency band (ranging from 1 to 24 for 1/3-octave bands with centre frequencies from 50 Hz to 10 kHz),
all data being normalised to the AIR-1845 atmosphere.
Adjustment of the NPD curves to user-specified conditions T and RH is performed in three steps:
First the reference spectrum is corrected to remove the SAE AIR-1845 atmospheric attenuation α n,ref :
Ln(dref) = Ln,ref(dref) + αn,ref · dref | (D-1) |
where Ln(dref) is the unattenuated spectrum at dref = 305 m and α n,ref is the coefficient of atmospheric absorption for the frequency band n taken from Table D-1 (but expressed in dB/m).
Next the corrected spectrum is adjusted to each of the 10 standard NPD distances di using attenuation rates for both (i) the SAE AIR-1845 atmosphere and (ii) the user-specified atmosphere (based on SAE ARP-866A).
For the SAE AIR-1845 atmosphere:
Ln,ref(di) = Ln(dref) – 20,lg(di/dref) – αn,ref · di | (D-2) |
For the user atmosphere:
Ln,866A(T,RH,di) = Ln(dref) – 20,lg(di/dref) – αn,866A(T,RH) · di | (D-3) |
where α n,866A is the coefficient of atmospheric absorption for the frequency band n (expressed in dB/m) calculated using SAE ARP-866A with temperature T, and relative humidity RH.
The increment ΔL is the difference between the NPDs in the user-specified atmosphere and the reference atmosphere. This is added to the ANP database NPD data value to derive the adjusted NPD data.
Applying ΔL to adjust both Lmax and LE NPDs effectively assumes that different atmospheric conditions affect the reference spectrum only and have no effect on the shape of the level-time-history This may be considered valid for typical propagation ranges and typical atmospheric conditions.
The Whole Directive you have selected contains over 200 provisions and might take some time to download. You may also experience some issues with your browser, such as an alert box that a script is taking a long time to run.
Would you like to continue?
The Schedules you have selected contains over 200 provisions and might take some time to download. You may also experience some issues with your browser, such as an alert box that a script is taking a long time to run.
Would you like to continue?
Latest Available (revised):The latest available updated version of the legislation incorporating changes made by subsequent legislation and applied by our editorial team. Changes we have not yet applied to the text, can be found in the ‘Changes to Legislation’ area.
Original (As adopted by EU): The original version of the legislation as it stood when it was first adopted in the EU. No changes have been applied to the text.
Point in Time: This becomes available after navigating to view revised legislation as it stood at a certain point in time via Advanced Features > Show Timeline of Changes or via a point in time advanced search.
Geographical Extent: Indicates the geographical area that this provision applies to. For further information see ‘Frequently Asked Questions’.
Show Timeline of Changes: See how this legislation has or could change over time. Turning this feature on will show extra navigation options to go to these specific points in time. Return to the latest available version by using the controls above in the What Version box.
Access essential accompanying documents and information for this legislation item from this tab. Dependent on the legislation item being viewed this may include:
This timeline shows the different versions taken from EUR-Lex before exit day and during the implementation period as well as any subsequent versions created after the implementation period as a result of changes made by UK legislation.
The dates for the EU versions are taken from the document dates on EUR-Lex and may not always coincide with when the changes came into force for the document.
For any versions created after the implementation period as a result of changes made by UK legislation the date will coincide with the earliest date on which the change (e.g an insertion, a repeal or a substitution) that was applied came into force. For further information see our guide to revised legislation on Understanding Legislation.
Use this menu to access essential accompanying documents and information for this legislation item. Dependent on the legislation item being viewed this may include:
Click 'View More' or select 'More Resources' tab for additional information including: