Continuous Descent Approach: Design and Flight Test for Louisville International Airport

TLDR

The approach yields a 3.9–6.5 dBA reduction in peak noise and a 7 % shrinkage of the 50‑day night‑average noise contour, a 50 % energy drop perceptible to listeners, and cuts fuel consumption by 400–500 lb, offering acoustic and environmental gains. The study aimed to design a noise‑abatement continuous descent approach for Louisville International Airport using a system‑analysis methodology. The authors applied a system‑analysis framework to develop the continuous descent procedure, integrating aircraft performance and noise modeling. Flight‑test results showed the procedure lowered peak noise by 3.9–6.5 dBA and fuel burn by 400–500 lb, and analysis confirmed that, despite pilot‑delay induced trajectory deviations, the approach is viable and motivates future pilot‑cueing and low‑noise guidance features.

Abstract

A design methodology based on the principles of system analysis was used to design a noise abatement approach procedure for Louisville International Airport. In a flight demonstration test, the procedure was shown to reduce the A-weighted peak noise level at seven locations along the flight path by 3.9 to 6.5 dBA, and to reduce the fuel consumed during approach by 400 to 500 lb (181 to 227 kg). The noise reduction is significant given that a 3-dB difference represents a 50% reduction in acoustic energy and is noticeable to the human ear, and the 7% reduction in the size of the 50 day night average noise level (DNL) contour that would result if all aircraft were to perform the procedure. The fuel saving is also significant, given the financial benefit to airlines and the accompanying reduction in gaseous and particulate emissions. Although the analysis of aircraft performance data showed how pilot delay, in combination with auto-throttle and flight management system logic, can result in deviations from the desired trajectory, the results confirm that near-term implementation of this advanced noise abatement procedure is possible. The results also provide ample motivation for proposed pilot cueing solutions and low-noise guidance features in flight management systems.