Delayed Deceleration Approach Noise Assessment

Abstract

Delayed Deceleration Approaches (DDAs) have the potential to minimize fuel burn by maintaining airspeed above the initial flap speed for as long as possible during approach operations. This reduces drag and associated engine power requirements, but the effects of DDA on approach noise impacts need to be understood if their greater use is to be encouraged. This paper presents an analysis of both empirical noise data from a noise monitoring campaign and simulated noise contours from an aircraft performance and noise model. Neither study showed significant positive or negative impact on noise from DDA operations outside the range of the scatter in the measured data.

Options for aircraft noise reduction on arrival and landing

“…In principle, we could include a slower air speed, but this is related to aircraft stall and to the ability to produce lift, which is a combination of high-lift system design and operation. Delayed deceleration is one option that has been assessed recently 1 . A fair comparison between trajectories can only be made when flight times and fuel consumption are taken into account, because an increase in any of these quantities might not be an acceptable solution to airline operators.…”