The Aircraft Particle Emissions eXperiment (APEX) was conducted
at NASA’s Dryden Flight Research Center April 2004 to afford the
scientific community an opportunity to systematically
investigate the emissions of a commercial-class aircraft, NASA’s
DC-8, during ground-based operation. APEX included participants
from more than ten institutions, each providing unique
measurement capabilities for trace gas and/or particle species.
JETS APEX2 was conducted at the Oakland International Airport in
August 2005 to was to develop TOG and PM speciation profiles for
engines used in older (CFM56-3) and newer (CFM56-7) Boeing
737-type commercial aircraft burning standard Jet A fuel. The
main objective of APEX3 was to advance the knowledge of aircraft
engine particle emissions. APEX3 was conducted at Cleveland
Hopkins International Airport (CLE) from October 26 to November
8, 2005. In APEX3, as in the previous studies, engine exhaust
emissions and plume development were examined by acquiring data
from the exhaust nozzle and