Annex 8

(Art. 40 para. 1)

Exposure Limit Values for Noise at Military Aerodromes

1 Scope

¹The exposure limit values specified in Number 2 apply to traffic noise from military aerodromes.

²Civil regional airports and airfields used for military purposes also count as military aerodromes.

³Helicopters are considered equivalent to propeller aircraft.

⁴Noise from repair workshops, maintenance workshops and similar operations at military aerodromes is considered equivalent to the noise from industrial and commercial installations (Annex 6 Number 1).

2 Exposure Limit Values

21 Exposure Limit Values expressed as Lr

22 Exposure Limit Values expressed as Lrz

In addition to the exposure limit values expressed as Lr, the exposure limit values specified in Annex 5 and expressed as Lr, referred to below as Lrz, also apply to the noise from civilian traffic at military airfields.

3 Determination of the Rating Sound Level

31 Principles

¹The rating sound level Lr for noise from military aerodromes is calculated from the rating sound levels Lrmfor military aircraft noise and Lrzfor civil aircraft noise, as follows:

Lr = 10 × log (10^{0,1×Lr m} + 10^{0,1×Lr z} )

²The rating sound level Lrzis determined in the same way as the corresponding Lr for civil aerodromes specified in Annex 5 Numbers 3 and 4.

³The rating sound level Lrmis determined from the partial rating sound levels Lrj, for noise from jet aircraft, and Lrp, for noise from propeller aircraft, as follows:

Lr m = 10 × log (10^{0,1×Lr j} + 10^{0,1×Lr p} )

⁴The partial rating sound level Lrjis the sum of the equivalent continuous A-weighted sound level Leqjarising from the operation of jet aircraft, and the level corrections K0and K1:

Lrj= Leqj+ K0+ K1

⁵The partial rating sound level Lrpis the sum of the equivalent continuous A-weighted sound level Leqparising from the operation of propeller aircraft, and the level corrections K0and K2:

Lrp= Leqp+ K0+ K2

⁶The equivalent continuous sound levels Leqjand Leqpare calculated for the average number of hourly flight movements for a day with an average level of traffic, whereby flight movements of jet aircraft and propeller aircraft are counted separately (number of flight movements njand np).

⁷Flight movements are all takeoffs and landings of jet and propeller aircraft. Go-arounds count as two flight movements.

32 Numbers of Flight Movements nj and np for Military Aerodromes

¹For existing military aerodromes, the number of flight movements njand npare determined as follows:

1. the six months of the operating year with the greatest amount of traffic are identified, whereby flight movements of jet aircraft and propeller aircraft are counted separately;
2. for these six months, the number of flight movements of jet aircraft Mjand propeller aircraft Mpare determined;
3. the numbers of flight movements njand npare calculated from Mjand Mpby averaging them over 130 days and twelve daytime hours:

nj= Mj/(12 x 130) np= Mp/(12 x 130)

²For military aerodromes that are to be built or modified, the numbers of flight movements njand npare determined from forecasts of traffic volume.

33 Level Corrections

¹The level correction K0is equal to -8.

²The level correction K1is calculated from the annual number of flight movements of jet aircraft Njas follows:

K1= 0 for Nj< 15 000

K1= 10 x log (Nj/15 000) for Nj≥ 15 000

³The level correction K2is calculated from the annual number of flight movements of propeller aircraft Npas follows:

K2= 0 for Np< 15 000

K2= 10 x log (Np/15 000) for Np≥ 15 000