Descent-Control Devices
A descent-control device lets you descend a primary support rope - typically from a boatswain's chair - then lock the device when you reach the work area. The device works by friction, engaging the support rope and controlling the descent speed.
Sailor on a Boatswain's Chair
Most workers start from the roof and work down the face of the building. When they reach the ground, they remove the descent equipment from the support rope and return to the roof for another drop. Click the image to the right to see the descent device more clearly.
Most falls result from failure of the primary support rope or a supporting anchor, not the descent device. Support ropes fail because workers don't inspect them regularly or they misuse them. Anchors fail when workers simply assume they are secure. Descent devices, support ropes, and anchors rarely fail when workers know how to use them. Personal fall-arrest systems are required for workers who use boatswain's chairs.
Knowledge Check Choose the best answer for the question.
4-9. Why do most falls occur when using a descent-control device with a boatswain's chair?
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