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This photo, taken from the CT-133 aircraft of research partner National
Research Council of Canada, shows the NASA HU-25C Guardian aircraft flying 250
meters behind NASA's DC-8 aircraft before it descends into the DC-8's exhaust
plumes to sample ice particles and engine emissions.
The flights are part of the Alternative Fuel Effects on Contrails and Cruise
Emissions or ACCESS II experiment, which is measuring and characterizing
airborne emissions from the DC-8 as it burns both conventional jet fuel and
blended alternative fuels, including a biofuel. NASA, with research partners
from Germany and Canada, is investigating fuel effects on aircraft cruise
emissions and contrail formation.
Within NASA, ACCESS II is a joint project involving Armstrong Flight Research
Center, California; Langley Research Center, Virginia; and Glenn Research Center
in Cleveland. The research supports NASA aeronautics' strategic vision, which
has as a goal to enable transition of industry to low-carbon fuels and
alternative propulsion systems.