4.4.3 Backrest and Armrest.
When more than one bench is provided in the same area, at least 50 percent of the benches shall have a backrest running the full length of the bench. In addition, one armrest shall be provided at one end or in the middle of at least 50 percent of the benches with backrests. The structural strength of backs, armrests, and mounting devices shall comply with section 903.6 of the ABAAS, which states: “Allowable stresses shall not be exceeded for materials used when a vertical or horizontal force of 250 pounds (1112 N) is applied at any point on the seat, fastener, mounting device or supporting structure.”
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