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CHAPTER 4 —Managing Aircraft NoiseCivil Aviation Department Environmental Report 200717

CHAPTER 4 —Managing Aircraft NoiseWhen managing Aircraft Noise impacts, we balance the needs of various stakeholders,including affected households and the aviation industry. This process of liaison isillustrated in the diagram below (Figure 5).As shown in the diagram, we would implement noise-mitigating measures whereverpossible. We also closely monitor aircraft noise and handle the complaints fromaffected households. We strive to achieve cost-effective solutions to the aircraft noiseproblem with the consultation of the airport and different airlines.In addition, we disseminate relevant noise data and keep an eye on the aviationtechnological developments with a view to introducing new practices on aircraft noisereduction.NoiseMonitoringComplaintsStakeholders:affectedhouseholdsCost-effectivenoise solutionsConsultationStakeholders:airportairlinesImplementmeasures(Figure 5)18 Civil Aviation Department Environmental Report 2007

Using Flight Paths Over Water to MinimiseNoiseTo keep aircraft noise impacts topopulated areas to an absolute minimumin the night-time hours, so long asweather and flight conditions allow, werequire arriving aircraft to approach theairport from the southwest, so that theyapproach over water, and depart via theWest Lamma Channel.In 2007, we targeted for 90% of all aircraftarriving between midnight and 7:00am toapproach from the southwest.In the same period, we targeted for 95%of all aircraft taking-off between 11:00pmand 7:00am to depart via the WestLamma Channel.These two arrangements ensure that during the overnight period, populated areassuch as Sha Tin, Tsuen Wan, Kwai Chung, Tsing Yi, Sham Tseng and Tsing Lung Tauare not affected by noise from arriving aircraft, while districts like Kowloon, North Point,Shau Kei Wan and Chai Wan are not affected by noise from departing aircraft.Civil Aviation Department Environmental Report 2007 19

Our Performance in 2007Statistical data shows that in 2007, 85.3%(2006, 88.1%) of all night arrivals were ableto land from the southwest. (Figure 6)No. of night arrivals15,000No. of night arrivals over water14,00013,00012,000No. of Flight11,00090%88.1%90%85.3%10,0009,0008,0007,000Year 2006 Year 2007(Figure 6)We achieved more success with night departures. In 2007, 99.3% (2006, 99.1%) ofall night departures were via the West Lamma Channel (Figure 7).No. of night departuresNo. of night departures over water23,00022,00021,00095%99.3%20,000No. of Flight19,00095%99.1%18,00017,00016,00015,000Year 2006 Year 2007(Figure 7)Target for 2008In 2008, we will retain the aforementioned 90% and 95% targets respectively for nightarrivals and departures over water.20 Civil Aviation Department Environmental Report 2007

Quieter ArrivalsWhen weather and flight conditions require night arrivals between 11:00pm and 7:00amto approach from the northeast, we encourage aircraft to adopt the ContinuousDescent Approach (CDA). By this procedure, aircraft would fly higher, adopt a lowerpower and drag configuration as they begin their approach, thus minimising the nighttimeaircraft noise impacts on areas such as Sai Kung, Tseung Kwan O and Ma OnShan.Our Performance in 2007In 2007, 82.8 % of aircraft approaching from the northeast between 11:00pm and7:00am attained CDA procedures.Target for 2008In 2008, we will continue to encourage the use of the CDA procedure.Quieter DeparturesAll aircraft departing to the northeast are required to use Noise Abatement DepartureProcedures (NADP) as long as safe flight operations permit.Prescribed by the International Civil Aviation Organization (ICAO)*, these proceduresrequire aircraft to commence engine power reduction in the initial phase of take-off atheights as low as 800 feet. This reduces the noise impact on affected households inthe vicinity of the airport when aircraft are required to depart to the northeast.Target for 2008Airlines are to continue to adopt the NADP for departures to the northeast of theairport.Note : * The International Civil Aviation Organization (ICAO) is a specialised agency of the UnitedNations. ICAO was created in 1944 to promote the safe and orderly development of international civilaviation throughout the world. It sets standards and regulations necessary for aviation safety, security,efficiency and regularity, as well as for aviation environmental protection. The Organization serves as theforum for cooperation in all fields of civil aviation among its 190 Contracting States.Civil Aviation Department Environmental Report 2007 21

Keeping Noisy Aircraft Out of Hong Kong Since 1 July 2002, old and noisy "Chapter 2" (#1) aircraft types that create seriousnoise pollution have been banned from using Hong Kong International Airport. Onlynewer and quieter "Chapter 3" (#2) aircraft are allowed to land in Hong Kong.Target for 2008To protect residents from unnecessary aircraft noise, the ban on Chapter 2 aircraft willremain in place.# 1 Note : "Chapter 2" aircraft are those aircraft which only comply with the noise standard stipulated inChapter 2 of Annex 16, Volume 1, Part II to the Convention on International Civil Aviation.# 2 Note : "Chapter 3" aircraft are those aircraft which comply with the more stringent noise standardstipulated in Chapter 3 of Annex 16, Volume 1, Part II to the Convention on International Civil Aviation.22 Civil Aviation Department Environmental Report 2007

Working with the PublicComplaint HotlineIn 2007, we received 349 complaints regarding aircraft noise (Figure 8), a 21%decrease compared to 2006.2006802007No. of complaints (monthly)706050403020100Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecNo. of Complaints5004003002001004423490Year 2006 Year 2007(Figure 8)Public and Government LiaisonIn 2007, we attended a total of 4 committee meetings of the Tsuen Wan DistrictCouncil, the Central and Western District Council, Tuen Mun District Council and theEastern District Council and 1 meeting with local communities. During these meetings,we explained the noise-mitigating measures we had implemented.Civil Aviation Department Environmental Report 2007 23

Noise Data We regularly uploaded new noise data to our website in 2007, enabling all members ofthe public to access our aircraft noise information.Target for 2008In 2008, we will continue maintaining contact with concerned parties on the subject,and continue serving the community with noise data and our complaint hotline.Noise MonitoringWe continued to use a sophisticated computer-based Aircraft Noise and FlightTracking Monitoring System (ANFTMS) to closely monitor aircraft noise in the vicinityof the flight paths in 2007. This system comprised 16 fixed noise monitors (Figure9), which continually collect noise data on a real-time basis. All noise data wereautomatically correlated with the radar information on flight tracks, enabling us tocompile accurate statistics on aircraft noise and more effectively investigate any noisecomplaints.Tai LamChungTsingLungTauTingKauWestTsuenWanKwaiChungTai WaiSha LoWanTungChungYan OMaWanTsing YiCentralJardinesLookoutNorthPointShau KeiWanNoise Monitoring Terminals(Figure 9)24 Civil Aviation Department Environmental Report 2007

Improvement Works in 2007In 2007, we procured 8 monitor equipment units for replacing some of the agedmonitors and the replacement work had been started in end 2007.Target for 2008In 2008, we will continue our program of replacing aged noise monitoring terminalswith units of new model to ensure the accuracy of the data. We will also continue toclosely monitor aircraft noise and flight tracks around the clock using the ANFTMS.Civil Aviation Department Environmental Report 2007 25

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