BS ISO 799-1:2019 pdf download – Ships and marine technology — Pilot ladders Part 1: Design and specification 5.6 Each pair of side ropes shall be secured together, both above and below each step, with specially designed step fixtures (chocks or widgets) which hold each step level when the ladder is hanging freely. Alternative acceptable arrangements are shown in Figure 1B. 5.7 If step fixtures are used to secure the side ropes and hold the step in place, the step fixtures shall not extend above or below the step surfaces by more than a distance equal to 0,7 × W (where W is the width of the step), so that the step is not prevented from rolling if caught between a boat and the hull of the ship. 5.8 If a seizing method is used to secure steps and side ropes, step fixtures shall be used above and below the step. The step fixtures shall be designed to lead and support the side ropes from the step to the point above or below the step where the side ropes are seized together. The step fixtures shall be designed so that they stay in place when the ladder is rolled or the step is turned. 5.9 The clear space between the side ropes on one side of the ladder and those on the other side shall be at least 400 mm, see Figure 2 and Figure 3. This distance shall be uniform throughout the length of the ladder, See Figure 1A. 5.10 Each side rope shall be arranged so that, when the ladder is in use against the vertical hull of a ship, the side rope cannot come in contact with the ship’s side. 5.11 A securing rope, if used to aid in rigging the ladder, shall be shackled at the upper end of each side rope of the ladder, as shown in Figure 1A and Figure 1B. Both securing ropes shall be of equal length and shall have a breaking strength of at least 48 kN. Securing ropes shall be fitted with a thimble. The other end shall be treated to prevent fraying. A suitable method to prevent fraying is a whipping. 5.12 The length of each securing rope shall be at least 3 m. The securing rope shall not be directly cut or spliced to the side rope. 5.13 The spacing from the top of one step to the...
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