Measurement of gaseous HAP emissions from idling aircraft as a function of engine and ambient conditions

This project characterized the dependence of gaseous hazardous air pollutants (HAP) and other partially combusted fuel emissions from aircraft on ambient and near-idle engine conditions, including temperature and engine thrust setting. The measurement work focused on characterization of on-wing CFM56 engines installed on commercial aircraft and operated according to airline practice. This project also developed a simple empirical framework (based on measurement data collected on variants of the CFM56 engine) that can be used in emissions scenario analysis--