Annex 5

(Art. 40 para. 1)

Exposure Limit Values for Noise from Civil Aerodromes

1 Scope and Definitions

¹The exposure limit values specified in Number 2 apply to the noise from civil air transport at civil aerodromes.

²Civil aerodromes means the national airports in Basel, Geneva and Zurich, the other licensed aerodromes and the airfields.

³Light aircraft means an aircraft having a maximum permissible take-off weight of 8618 kg or less.

⁴Heavy aircraft means an aircraft having a maximum permissible take-off weight of over 8618 kg.

⁵The noise from repair workshops, maintenance works and similar operations at civil aerodromes is considered equivalent to the noise from industrial and commercial installations (Annex 6 Sec. 1).

2 Exposure Limit Values

21 Exposure Limit Values for Light Aircraft Traffic Noise, expressed as Lrk

22 Exposure Limit Values for Total Traffic Noise from Light and Heavy Aircraft, expressed as Lr

For the total traffic noise from civil aerodromes used by heavy aircraft, the following exposure limit values apply in addition to the exposure limits expressed as Lrk:

221 Daytime Exposure Limit Values (06-22 hours), expressed as Lrt

222 Night Time Exposure Limit Values for the first (22-23 hours), the second (23-24 hours) and the last night hour (05-06 hours), expressed as Lrn

23 Exposure Limit Values expressed as max

For civil aerodromes used exclusively by helicopters (heliports), the following exposure limit values, expressed asmax, apply in addition to the exposure limits expressed as Lrk:

3 Determination of the Rating Sound Level Lrk for Light Aircraft Noise

31 Principles

¹The rating sound level Lrkfor light aircraft noise is the sum of the equivalent continuous A-weighted sound level Leqkand the level correction K:

Lrk= Leqk+ K

²The equivalent continuous sound level Leqkis determined for the average number of hourly aircraft movements (number of movements n) for a day with average peak operations.

³Aircraft movements are all landings and takeoffs of light aircraft. Go-arounds count as two flight movements.

32 Number of Aircraft Movements n for existing Civil Aerodromes

For existing civil aerodromes, the number of aircraft movements n is determined as follows: the six months with the greatest amount of traffic during the operating year are identified; for these six months, the average daily number of flight movements is determined separately for each of the seven days of the week. The average daily values for the two days of the week with the most traffic are designated as N1 and N2; n is determined by averaging N1 and N2 over the twelve daytime hours as follows: n = (N1 + N2)/24

33 Number of Aircraft Movements n for new Civil Aerodromes

¹For civil aerodromes which are to be built or modified, the number of flight movements n is determined from forecasts of traffic volume.

²If no detailed forecasts can be made, n is calculated from the forecasted annual number of aircraft movements N as follows:

n = (N x 2,4)/(365 x 12)

34 Level Corrections

The level correction K is calculated from the annual number of aircraft movements N as follows:

K = 0 for N < 15 000

K = 10 x log (N/15 000) for N ≥ 15 000

4 Determination of the Rating Sound Level Lr for Traffic at Civil Aerodromes used by Heavy Aircraft

41 Principles

¹At civil aerodromes used by heavy aircraft, the rating sound level Lr of total traffic is determined based on the relevant aircraft traffic, whereby separate calculations are made for daytime (06-22 hours), and for the first (22-23 hours), second (23-24 hours) and last (05-06 hours) night hours.

²At civil aerodromes used by heavy aircraft, the daytime rating sound level for total traffic Lrtis calculated from the rating sound levels for light aircraft Lrkand heavy aircraft Lrgas follows:

Lrt= 10 x log (10^{0,1 xLr} k + 10^{0,1 xLr} g )

³For heavy aircraft noise, the daytime rating sound level is the sum of the equivalent continuous A-weighted sound level Leqgarising from aircraft operations between 06 and 22 hours, averaged over one year:

Lrg= Leqg

⁴For heavy aircraft noise, the rating sound level Lrnfor the first, the second and the last night hour is the equivalent continuous A-weighted sound level Leqn, each averaged over one hour, arising from aircraft operations during the periods 22-23, 23-24 hours and 05-06 hours, averaged over one year:

Lrn= Leqn

42 Relevant Aircraft Traffic

¹The equivalent continuous sound levels Leqgand Leqnare determined from the operational data.

²For civil aerodromes that are to be built or modified, the relevant aircraft traffic is determined from forecasts of traffic volume.

³Flights taking place after the second night hour (23-24 hours) and before the last night hour (05-06) are assigned to the second night hour (23-24 hours).

5 Determination of the Average Maximum Noise Level max for Heliports

¹The average maximum noise levelmax for heliports is the energetic average of the maximum noise level of a representative number of passing flights or overflights.

²Measurements ofmax are carried out with the instruments set on SLOW.