United States Department of Transportation
i
NextGen Final Report: Data for Updating 14 CFR Part 25.143 and Potential Reference Standards for Part 23, 27, and 29 Aircraft: An Evaluation of Muscular Force That Can Be Applied to Flight Controls
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2019-06-01
[PDF-1.90 MB]
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Abstract:The Code of Federal Regulations (14 CFR 25.143) contains maximum limitations on the force that a pilot can be expected to exert on manual controls. There are currently no reference standards contained in Parts 23 (General Aviation; rewritten in 2017), 27, and 29 (rotorcraft). A number of recent previous studies suggested that the CFR reference forces were too high to allow a significant portion of the population to attain them. In an attempt to obtain a reasonably large contemporary sample to update knowledge on this topic, human-performance data were collected, at several sites, for both pilots and nonpilots using stratified sampling for age, gender, and pilot status to achieve a comprehensive sample. The criterion values in the CFR were compared with data from these samples to determine what proportion of both potential (nonpilot) and actual pilot populations could apply the maximum forces allowed by the present rule. Results are presented in the form of both success/failure rates and distributions of obtained performance. Significant portions of the females' samples were not able to achieve the short-term reference values for the various controls (over 60% for all controls). Between 15% and 65% of the males' samples, depending upon the control type, were unable to meet the reference short-term force values. The complete distributions by percentiles are provided so that policy makers can determine, based upon the percentage of the overall population to be accommodated, what the appropriate reference values should be. This will inform an update of 14 CFR 25.143 and the formulation of industry-consensus standards to support NextGen in safely accommodating the current pilot population in the next generation of aircraft.
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