Home > Aircraft Noise Management
1. Throughout the new airport
master planning process, the Airport Authority in conjunction
with the government have conducted assessments to determine
the effects of aircraft noise impacts on off-airport areas.
The noise impact assessment was conducted in accordance with the guidelines
set out by the International Civil Aviation Organization (ICAO)
and the Federal Aviation Administration (FAA) of the United States Department of Transport. The FAA's
Integrated Noise Model (INM) which is considered a state-of-the-art
tool for assessing airport noise exposure, was used to generate
3. According to the New Airport Master Plan – Environmental Impact Assessment (NAMP-EIA) completed by the Airport Authority in 1991, its Supplement in 1992 and its Update completed in 1998, only a very small number of residents in North Lantau, predominantly in Sha Lo Wan, are within the coverage of the NEF 25 contour of the new airport at design capacity and regarded as subject to aircraft noise beyond acceptable level from a planning and land use point of view.
4. CAD has conducted noise measurements in several districts under the flight paths. The measured noise levels are summarised in the table below:-
Noise Levels at Various Districts
5. Since airport opening, several briefings on aircraft noise and flight paths have been given to the concerned District Councils including Kwai Tsing, Sha Tin, Tsuen Wan, Central & Western, Kowloon City, Southern, Yau Tsim Mong, Wanchai, Eastern, North, Islands, Tuen Mun and Sai Kung.
6. The government is conscious of the effect that night-time aircraft operations may have on the local communities and has implemented a number of aircraft noise mitigating measures based on the guidelines of the ICAO to reduce the noise impact caused by these aircraft. Briefly, these are:-
a) since October 1998, subject to acceptable operational and safety consideration, arriving aircraft between midnight and 07:00 am are required to land from the southwest. This measure aims at reducing the number of aircraft overflying populated areas such as Sha Tin, Tsuen Wan, Sham Tseng and Tsing Lung Tau;
b) since October 1998, subject to acceptable operational and safety consideration, aircraft departing to the northeast of the Hong Kong International Airport (HKIA) between midnight and 07:00 am are required to use the southbound route via the West Lamma Channel. This measure aims at reducing the number of aircraft overflying populated areas such as the Kowloon Peninsula and Hong Kong Island. Following further consultation with the district boards and detailed assessment by CAD, the application period was revised from midnight – 07:00 am to 11:00 pm – 07:00 am starting from 7 January 1999.;
c) since August 1999, aircraft departing to the northeast of the HKIA are required to adopt the noise abatement take-off procedures so as to reduce the noise impact on areas located in the vicinity of the HKIA. Under these procedures, aircraft are required to maintain a specified speed and power level during the initial phase of the take-off so as to attain a higher altitude within a short distance. In order to further alleviate the noise impact during take-offs, ICAO revised the noise abatement take-off procedures. Aircraft adopting these revised procedures are required to reduce their power upon reaching an altitude of 800 feet or above to abate aircraft noise. Starting from March 2002, aircraft departing to the northeast of the HKIA are required to adopt the revised noise abatement departure procedures;
d) to reduce aircraft noise at source, effective from late October 1999, airlines are not allowed to schedule aircraft that do not comply with the noise standards stipulated in Chapter 3 of Volume I, Part II of Annex 16 to the Convention on International Civil Aviation (Chapter 3 noise standards) to operate in the HKIA between 11:00 pm and 07:00 am. To be in line with international practice in phasing out noisier aircraft, starting from July 2002, this measure has been extended to cover the whole day;
e) starting from mid-August 2000, all aircraft approaching the HKIA from the northeast between 11:00 pm to 07:00 am are encouraged to adopt the Continuous Descent Approach (CDA), subject to operational considerations. As aircraft on CDA fly higher, noise experienced in areas such as Sai Kung and Ma On Shan will be lowered;
f) the CAD has implemented a new set of flight procedures since 2012 to allow aircraft equipped with satellite-based navigation technology to adhere closely to the nominal centre line of the flight track when departing to the northeast of the HKIA and making south turn to the West Lamma Channel. This keeps the aircraft at a distance away from the areas in the vicinity of the flight paths (e.g. Ma Wan), and reduces the impact of aircraft noise on these areas; and
g) starting from late March 2014, the CAD has no longer allowed airlines to schedule aircraft which are marginally compliant with the Chapter 3 noise standards to land and take off in Hong Kong between 11:00 pm and 07:00 am. With effect from late October 2014, this measure has been extended to cover the whole day, thus further alleviating the aircraft noise impact on the local communities.
7. The CAD monitors the noise caused by aircraft operations through a computerised Aircraft Noise and Flight Track Monitoring System (ANFTMS). The ANFTMS comprises 16 outdoor noise monitoring terminals (NMTs) which are located along or close to the flight paths operating into and out of the HKIA, and a computer to correlate the noise data with the aircraft flight tracks recorded by the CAD's radar system. At present, there are a total of sixteen noise monitoring terminals installed which are located respectively at Sha Lo Wan, Tung Chung, Sunny Bay (formerly known as Yam O), Ma Wan, Tsing Yi (2 terminals), Tam Lam Chung, Tsing Lung Tau, Ting Kau, Tsuen Wan, Kwai Chung, Tai Wai, Mid-Levels, North Point, Jardine's Lookout and Shau Kei Wan.