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Aircraft Particle Emissions Experiment

The research team of JETS-APEX2 sampled the exhaust of four B737s with CFM56 engines at Oakland International Airport to develop detailed profiles of trace gas, particulate matter (PM), and hydrocarbon emissions of modern in-service commercial jet aircraft.

During testing, the aircraft were parked in a special three-sided enclosure.  Exhaust from both engines on the aircraft was measured simultaneously at six different thrust settings: 4%, 7%, 30%, 40%, 65% and 85%.  Testing took place between 9pm and 5am, since that is when the aircraft were available.  The aircraft were selected to represent both old and new technologies (two aircraft were -300 series and two were -700 series).

In addition to these experiments, the project also included a second set of measurements sampling jet engine exhaust downwind of an active taxiway and runway at Oakland International Airport while the aircraft performed standard Landing and Take-Off (LTO). The runway tests demonstrated the potential of downwind emissions monitoring adjacent to active taxi- and run- ways as a means to rapidly acquire evolving aircraft PM characteristics from in-service commercial aircraft. Emissions were monitored during a twelve hour period of daylight aircraft operations along a single runway where the downwind exhaust plumes for over 300 aircraft were sampled.

Data from these tests will be used to improve air quality prediction models used in Environmental Impact Statements and Reports for airport expansion projects and for developing effective State Implementation Plans.

Team members include scientists and engineers from the California Air Resources Board, NASA, FAA, EPA, University of Missouri-Rolla, University of California Riverside, University of Central Florida, General Electric, Boeing and the Aerodyne Corp.

JETS-APEX2 took place in August 2005 at Oakland International Airport.