TM 10-3950-672-10
Caution must be used when lowering or extending the boom let out cable simultaneously to prevent two-blocking the
boom nose and hook block. The closer the load is carried to the boom nose the more important it becomes to
simultaneously let out cable as the boom is lowered. Keep the hook block, etc. at least 12 in. (30.48 cm) away from the
boom nose at all times.
2-5. CONTROLLED FREE-FALL HOIST.
When using your crane during controlled free-fall hoisting operations, the following recommendations are offered:
WARNING
Exercise caution when using (optional) controlled free-fall hoists smooth and gradual snubbing of load is necessary to
avoid high shock loads.
Use single-part (line) reeving only.
Fully extend and set the outriggers.
Ensure the crane is level and on a firm supporting surface.
Use main boom whenever feasible.
Reduce load values to 30% of the crane's rated load values or 50% of the permissible line pull values as indicated on the
crane load capacity chart or the hoist manufacturer's maximum allowable rating, whichever is less.
2-17
