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Fortunately, an alternative procedure was available. At the time, it was recognised that design nomographs for the unique 6-wheel gear did not exist, and moreover, that the extension of the underlying design method (in particular the CBR equation with alpha factor) to 6-wheel configurations and higher might not be correct. The FAA’s transition to computer-based design procedures has been gradual, and was originally driven by the introduction of 6-wheel aircraft gears in the 1990’s, as represented by the Boeing B777. The revised AC will make FAArfield the FAA’s standard thickness design procedure for both rigid and flexible pavements, including overlays, and will retire the FAA nomograph-based design procedures. In addition to putting the finishing touches on the FAArfield software, the FAA is also substantially rewriting the Advisory Circular (AC) covering Airport Pavement Design and Evaluation (AC 150/5320-6D). The new program is called FAA Rigid and Flexible Iterative Elastic Layered Design, but is known by its acronym, FAArfield.
RIGID PAVEMENT DESIGN SOFTWARE SOFTWARE
After a 10-year research and development effort, the Federal Aviation Administration (FAA) is set to debut a new software package for airport pavement thickness design.