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The Ljappa arm is required for construction of the Mir Station. The Ljappa arm is a mechanically-driven arm which is used to move modules from the forward (or axial) docking ports to permanent radial docking ports. The arm is mated onto a socket that is located on the Mir’s multiple docking assembly adjacent to the -XB end of the Base Block. Once the arm is mated, the modules main docking probe is retracted, and the arm raises the module so that it can be pivoted 90° for docking to one of the radial docking ports.--Craigboy (talk) 17:49, 5 February 2012 (UTC)