184.108.40.206.6 Skirt Panels
(a) The height of the skirt above the tread nose line shall be at least 25 mm (1 in.) measured vertically (see Nonmandatory Appendix I, Figure I-4).
(b) The skirt panel design and installation shall not permit deflection of more than 1.6 mm (0.06 in.) under a force of 667 N (150 lbf).
(c) The exposed surfaces of the skirt panels adjacent to the steps shall be smooth.
(d) Skirt Deflection Test and Marking/Labeling. Each skirt panel design shall be tested for deflection with load per (b) as described in 8.3.15. Skirt panels shall be marked with the part number or identifying mark and marked/labeled with the following: "Replacement shall meet OEM and A17.1/B44 Code requirements."