TM 5-3810-302-10
Caution must be used when extending the boom - let out cable simultan-
eously 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 simul-
taneously let out cable as the boom is extended. Keep the hook block, etc. at
least 12 inches (30.48 cm) away from the boom nose at all times.
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