220.127.116.11.20 Clearance Between Step and Skirt (Loaded Gap)
(a) Loaded gap measurements shall be taken at intervals not exceeding 300 mm (12 in.) in the transition region (18.104.22.168.5) and before the steps are fully extended. These measurements shall be made independently on each side of the escalator.
(b) The applied load shall not deviate from 110 N (25 lbf) by more than ±11N (±2.5 lbf) (22.214.171.124.5). The load shall be distributed over a round or square area no less than 1940 mm2 (3 in.2] and no more than 3 870 mm2 (6 in.2).
(c) For the loaded gap measurements, the center of the applied load shall be between 25 mm (1 in.) and 100 mm (4 in.) below the nose line of the steps. The center of the applied load shall be not more than 250 mm (10 in.) from the nose of the step. See Figure 126.96.36.199.19.