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1. Understand the force difference at the tie-in point when a climber is tied-in as opposed to belayed from the ground. 2. Become familiar with the parts of a block and tackle used for tree work. 3. Know the assumptions required in order to calculate mechanical advantage in simple rigging situations. 4. Calculate mechanical advantage and reaction forces when pulleys are used in tree work. 5. High strength block and tackle systems for pretensioning lines or lifting heavy objects.

Instructions | Petzl Rigging Operations Work Positioning with Back Up The work positioning system is always backed-up. Here the Petzl Grillon are being used.

Instructions | Petzl Rigging Operations SRT The single rope technique employs a static line climbing system and is used as a means of canopy access only. Here the Frog System is being used.

Instructions | Petzl Rigging Operations Descent with Rope Recovery Technique for descent allowing the rope to be recovered. Shown here is the Petzl I'D.

Instructions | Petzl Rigging Operations Working Postioning with Back Up Prusik Work positioning using a Petzl Grillon and double ropes with prusik.

Instructions | Petzl Rigging Operations DRT (modified) Double Rope Technique (DRT) is used to self belay the climber in such a way that the rope can be retrieved without going back up the tree.