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The text in the new rule from the U.S. Federal Aviation Administration (FAA) lists 88 operational parameters required to be recorded by digital flight data recorders (DFDR). To meet each of these requirements, based upon the design of an airplane, more than one parameter may need to be recorded by the flight data recorder (FDR) at the same time. An example of this is the operational parameter thrust/ power of each engine-primary flight crew reference. On most Boeing- and Douglas-designed airplanes, two parameters (signals) per engine are provided to the FDR system to capture the thrust/power of each engine. As a result, 88 defined operational parameters in the FAA rule will result in many more than 88 parameters actually recorded. To avoid confusion, Boeing identifies each of the 88 operational parameters in the new FAA FDR rule as 88 parameter groups, as each can require recording more than one parameter.