This is the third report in the series concerning Overground Excess Attenuation, ESA. Different models and algorithms for computing ESA are compared in terms of differences in A-levels at varying distances for different aircraft noise spectra. ESA values from recent field measurement at Wright-Patterson AFB, Dayton OH, theoretical models, and from NOISEMAP and a SAE recommendation are compared. It is recommended that the current NOISEMAP ESA algorithms be replaced with ESA curves based on Dayton data acquired under moderate downwind propagation conditions. It is also recommended that additional ESA field data be acquired over irregular terrain where direct line-of-sight propagation does not exist.


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