Chapter 14. Anthropometry and Biomechanics - FAA
Chapter 14. Anthropometry and Biomechanics - FAA
Chapter 14. Anthropometry and Biomechanics - FAA
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HFDS 2003 (amended Oct 2009)<strong>Chapter</strong> 14 <strong>Anthropometry</strong> <strong>and</strong> biomechanicsExhibit <strong>14.</strong>5.2.1 (continued) Design criteria for male muscle strength of the arm, h<strong>and</strong>, <strong>and</strong>thumb for control forces (5th percentile values)H<strong>and</strong> <strong>and</strong> thumb-finger strength N (lb)8 9 10H<strong>and</strong> grip Thumb-finger Thumb-fingerL R grip (palmer) grip (tips)Momentary hold 200 208 48 48(44.8) (47.2) (10.4) (10.4)• <strong>14.</strong>5.2.2 Increasing strength values. Strength values shall beslightly increased if:a. a lifting yoke or other special harness is t o be used,b. the object is unusually easy to h<strong>and</strong>le,c. the required force must be applied infrequently or onlyfor a few seconds, if more than one per 30 seconds,decrease by .30 ord. the working body parts are provided with suitablesupport. [Source: MIL-HDBK-759B, 1992; MIL-STD-1472D,1989; MIL-STD-1800A, 1990; AFSC DH 1-3, 1980]14-45
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