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event that the master switch is moved to OFF and one contactor sticks, the second contactor should interrupt the power. Fall  Tensioning  Device The fall tensioning device keeps the hook above the heads of the boat crew before boat hookup and after release. This reduces the danger to the boat and to the crew from a swinging hook assembly. When the hook is cast  off  during  launching,  the  fall  tensioning  device counter-weighted sheave causes the hook to rise clear of the boat and crew. Figure 4-16 is an example of a fall tensioning  device. Fluid Brake A fluid brake is attached to the output shaft of the electric  clutch  on  the  SLAD  hoist  drive  motor.  The purpose of this fluid brake is to regulate the speed of a descending  boat  thus  preventing  any  damage  to  the equipment  or  personnel. Safety Handcranks Safety handcranks include an overriding mechan- a winch motor is energized while the winch is being manually cranked, no force is exerted on the crank handle  from  the  winch  side  and  thus  prevents  back drive. This device may be used in place of handcrank electrical  interlock  switches.  For  the  SLAD,  the formlock  clutch  prevents  the  back  drive  of  slewing  and hoist handcranks and thus both drives can be power driven  with  the  handcranks  being  engaged. DECK  FITTINGS LEARNING OBJECTIVE: Recognize common deck fittings found aboard ships and explain their  purpose. Deck fittings are the various devices attached to the hull that assist in handling the ship. The most common fittings are found around the weather decks. A brief description of some common ism. This mechanism functions in such a manner that, if deck  fittings  (fig.  4-17)  follows. Figure 4-17.–Various deck fittings. 4-17

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