According to the Ministry of Land, Infrastructure, Transport and Tourism, the flight course after construction of the 3rd runway and extension of Runway B is assumed as follows.
- In order to minimize expansion of noise affected areas, straight ascending and straight descending flight course, which is equivalent to the current procedure, will be adopted in principle.
- On the north side of Runway B, the flying altitude of landing airplane is assumed to become lower due to extension of the runway northward.
- On the south side of Runway C, flying altitude is assumed to become lower compared to the airplanes landing and taking off on the existing Runway B because a new runway is going to be constructed on the south side of Runway B.
Noise contours based on the preconditions of 500,000 times are shown below.
Plans of noise control zone regulated by the Noise Prevention Act (*1) and Special Noise Countermeasures Act (*2) have been formulated based on these noise contours in view of cohesion of neighboring houses, landform, terrestrial objects, etc.
*1:Act on Prevention of Damage caused by Aircraft Noise in Areas around Public Airports *2:Act on Special Measures concerning Countermeasures against Aircraft Noise around Specified Airports
As for respective noise control zone, please confirm the attachment files.（Drawing of noise control zone regulated by the Noise Prevention Act and Special Noise Countermeasures Act）
- Lden62dB ＝
- Corresponds to Category I zone of Act on Prevention of Damage caused by Aircraft Noise in Areas around Public Airports (aid to the noise control work to residential houses, air conditioning function recovery construction, etc.)
Corresponds to aircraft noise control area specified by Act on Special Measures concerning Countermeasures against Aircraft Noise around Specified Airports (liable to adopt noise insulation structures to buildings)
- Lden66dB ＝
- Corresponds to Specific aircraft noise control area specified by Act on Special Measures concerning Countermeasures against Aircraft Noise around Specified Airports (residential houses and schools cannot be built, compensation for relocation expenses, purchase of land)
*Weather condition is set to the typical values (temperature 25 degrees Celsius, humidity 70%, calm)
Lden (Time-zone corrected day-evening-night equivalent sound level, unit:[ dB ])
Lden is an evaluation index of ambient criteria for aircraft noise and is used to evaluate the noise in Act on Prevention of Damage caused by Aircraft Noise in Areas around Public Airports and Act on Special Measures concerning Countermeasures against Aircraft Noise around Specified Airports. It represents the amount of noise in a day with the corrected value of +5dB in the evening hours (19:00-22:00) and +10dB in the nighttime (0:00-7:00 and 22:00-24:00) when the noise is heard louder than it actually is.
The noise affected areas will not be expanded compared to the existing noise control zone as to Runway A while such areas will be expanded as to Runway B and C because:
(1) Airplane's downsizing and noise reduction have advanced significantly compared to the airplane composition at the time noise control zone for Runway A was specified (1982).
(2) 170,000 times of flight operation is expected on north and south sides together on Runway A while 170,000 times of flight operation is expected on only north or south side on Runway B and C.
The following tables show the premises to draw the noise contours.
Image of crossing altitude and noise level
- * Facilities and spots of the picked-up points are not always located immediately below the flight route; they are landmark buildings, etc. in such vicinity.
- * Crossing altitude of landing airplane is an altitude assuming a case of an airplane descending at 3 degree based on the ILS (Instrument Landing System) approach system. Also, the touch-down point on the runway is regarded as the reference (0m) for the altitude, and elevation of respective points are not taken into consideration.
- * Values for crossing altitude of airplanes taking off are not included because they depend on the airplane type, take-off weight, weather conditions, etc.
- * Maximum noise value (estimation) is an estimated value based on respective maximum noise values of huge airliners (representative model: B777-300ER) and small airplanes (representative model: A320) in the scope of the measured data of past survey for areas around Narita Airport.
- * As for Runway A, the aircraft altitudes after capacity enhancement will remain the same as the present situation.