Getting to Grips with Aircraft Noise

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4-AIRCRAFT NOISE MANAGEMENT AROUND AIRPORTS 4.3. POTENTIAL IMPACTS ON OPERATIONS In the light of the previous considerations, noise constraints, depending on their level, may impact airline flight operations. For existing airports, the noise zoning plan is helpful in order to specify the most efficient remedy to alleviate noise in an already populated (that is to say-sensitive) area. Typically, such measures, which can be combined, are: 1. To enact a maximum permissible noise level, the value of which is relevant to target the intended noise index values in the considered region (also given the forecasted traffic and associated trajectories). 2. To classify the aircraft on a “quota count” scale, which means clearance for a limited number of operations per day depending on the noise level of the aeroplane. 3. Curfews 4. The preferential use of a runway 5. Noise abatement procedures Such limitations may be coped with/attenuated in close co-operation between Airbus and the operator through the elaboration of appropriate operational procedures, namely the Noise Abatement Procedures. The goal of these is to reduce as much as possible the noise perceived on ground while maintaining the highest level of flight safety (see also Section 5): - Pilots must not be overloaded, nor the ATC - Minimum separation between aircraft must be respected This is the reason why attention must be paid in the design process of Noise Abatement Procedures in order to avoid additional (and unnecessary) fees and restrictions (payload reduction, night-time curfews, quotas) Consequently, because of this apparently difficult compromise, such procedures were late in being introduced in the ICAO PANS OPS, an overview of which is given hereafter. 22 Flight Operations Support & Line Assistance Getting to grips with aircraft noise
Flight Operations Support & Line Assistance Getting to grips with aircraft noise 5 - NOISE ABATEMENT PROCEDURES 5. NOISE ABATEMENT PROCEDURES This section deals with the presentation of various kinds of Noise Abatement Procedures (for departure and approach). For takeoff, one type aims at reducing noise exposure in the airport vicinity, while the other is dedicated to noise alleviation remote to the airport. For approach, several ways of investigation are discussed. Typical procedures are recommended by the ICAO in PANS-OPS VOLUME 1 PART V CHAPTER 3, in order to reduce the community noise. While accounting for the published constraints (Standard Instrument Departures, airport published Noise Abatement Procedure), these ICAO noise abatement procedures shall be applied when noise benefits can be expected. In no way must they prevail over safety aspects. In line with this philosophy, the pilot always retains full authority not to comply with such a procedure (even when published) if safety margins may be reduced by its application (i.e. in case of emergency). 23
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Getting to Grips with Aircraft Noise

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