NOISE DATA FOR A TWIN-ENGINE COMMERCIAL JET AIRCRAFT FLYING CONVENTIONAL, STEEP, AND TWO-SEGMENT APPROACHES

摘要

Center-line noise measurements of a twin-engine commercial jet aircraft were made during steep (-5° and -4°) landing approach profiles, and during a two-segment (-5°/-3°) approach profile for comparison with similar measurements made during conventional (-3°) approaches. The steep and two-segment approaches showed signif¬icant noise reductions when compared with the -3° base line.nThe measured noise data were also used to develop a method for estimating the noise under the test aircraft at thrust and altitude conditions typical of current landing procedures and of landing procedures under development for the Advanced Air Traffic Control System.