Studies of CDA
Continuous descent approaches (CDAs) have noise and emission benefits in low traffic environments based upon the study at the Louisville airport.
The noise and emission benefits derived for the nighttime arrivals at the Louisville airport are well documented scientifically, however, the implementation of full-time continuous descent approaches at Los Angeles International Airport were done with altitudes that were exactly opposite as to what was done at Louisville. CDA's utilized in high traffic environments must be kept at levels lower than conventional step-down approaches, otherwise, the jets will catch up with one another. This negates the noise and emission benefits.
Studies at a number of airports began in approximately 1999, and continued through 2004-2006. It appears that procedures were adopted by some airports such as London Heathrow around 2003-2004. NASA continued to conduct studies into the EDA technique through 2010.
Read more about this topic: Continuous Descent Approach
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“What happiness did poor Mother’s studies bring her? It is the melancholy tendency of such studies to separate people from their friends and neighbors and fellow creatures in whom alone lies one’s happiness.”
—Mary Potter Playne (c. 1850–?)