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Chapter2. Theory 14 and product life cycle. Chapter 4 of the first volume of said annex deals with the aircraft noise of subsonic jet aeroplanes whose certification has been submitted after January 2006 and is therefore the most contemporary design limiter [16, 38]. The annex lists three reference measurement points at which noise criteria have to be met. These points are: • Lateral full-power reference noise measurement point, also labelled side- line point (SL), at a line parallel and 450 m to the runway center line, where the noise level is maximum during takeoff; • Flyover reference noise measurement point, also labelled cutback point (CB), at the extended runway center line after 6.5 km from the start of roll; • Approach reference noise measurement point, approach point (APP) at the extended runway center line, 2 km from the threshold. The maximum noise levels allowed depend on the reference point and the maxi- mum take-off weight (MTOM) of the aircraft and the engine configuration. They are listed in Table 2.1. Table 2.1: Maximum noise levels for aircrafts whose certification has been submitted after January 2006, based on reference point and MTOM [16]. In addition, the annex gives details on possible amendments if noise limits are exceeded, the flight procedures and the testing conditions such as atmospheric conditions and aircraft speed [16]. 2.3.3 Free Jet Acoustics Section 2.2 already touched on the subject of noise generation due to turbulent flows. This section expands on this knowledge and deals with the manifold sound sources of an isolated aeroengine jet and under the effects of a wing. When assessing the sound field of a jet, it has to be considered that the noise generatedPDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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