TM  1-1520-240-10            4-3-9 CAUTION Some    pulley    block    assemblies    have flanges with cable retainer pins as shown in  fig.  4-3-9  (Sheet  1  of  2).  These  pins should be installed only if the cable makes a wrap angle of 180_ or more around the pulley. Otherwise, the cable will bind on the pins and overload the winch and cable. When not in use, the pins and attaching hardware should be stowed in the contain- er provided for the hoist accessories. (2) Install the pulley block assembly on the floor at sta 140, the overhead on the aft face of sta 120 bulk- head and the cable cutter pulley block over the rescue hatch (fig. 4-3-9 (Sheet 2 of 2)). (3) Reeve the cable through the pulley at each location by first removing the quick-release pin, removing the pulley and positioning the cable over the pulley. Rein- stall each pulley and secure with the quick-release pin (fig. 4-3-9 (Sheet 1 of 2)). Figure  4-3-9.  Hoisting System (Sheet 1 of 2) WARNING The  quick-disconnect  cover  guard  must be installed during rescue and cargo op- erations.  Otherwise,  the  hook  assembly can  be  inadvertently  disconnected  from the winch cable which can result in loss of life or the load or serious injury to operat- ing personnel. For personnel rescue, the cable  must  touch  the  ground  or  water prior to touching personnel or a danger- ous static electrical shock may result. (4) Attach  the  winch  cable  to  the  cable  hook assembly by depressing the lock rings on each end of the quick-disconnect device, inserting the ball ends of the winch and hook assembly cables into the quick-discon- nect device and releasing the lock rings. Install the quick- disconnect cover guard. WARNING Slack  must  be  removed  from  the  cable train before applying the full load to the winch system to prevent shock and over- load of the system and possible injury to the personnel being hoisted. CAUTION Ensure that the load is clear of the ground and all obstacles before proceeding from hover to forward flight. Do not exceed 600 pounds. An overload can result in damage or failure of the support structure for the overhead cable pulley. (5) Reel the cable out and attach the cable hook to load — Reel in or out as required. g. When electrical power to the winch is not avail- able, the winch may be operated in emergency mode as follows: CAUTION When the winch is operated in emergency mode,  the  cable  limit  switches  are  dis- abled. To avoid kinking the cable, stop the winch when there is no less than 3 turns of cable on the drum. Stop reeling the cable in  when  the  quick-disconnect  guard  as- sembly  contacts  the  pulley  and  fairlead (fig. 4-3-1). (1) Remove electrical connectors from the hoist control valve and hoist control shutoff valve on the left bulkhead of the heater compartment (fig. 4-3-10).