TM 5-3810-302-10
Two-Blocking MUST BE "AVOIDED, to prevent damage to your crane and
to avoid creating a safety hazard. Two-Blocking exists whenever the load
block, headache ball, rigging, etc. come into physical contact with the boom,
boom nose, sheave, jib etc. Two-blocking can cause hoist lines (wire rope)
rigging, reeving, and other components to become highly stressed and over-
loaded in which case the wire rope may fail allowing the load, block, etc. to
free falI.
The SCAMP is equipped with an antitwo-block device with audio-visual
alarms and control lever lockout to assist the operator in preventing two-
blocking. Ensure that the system is operative prior to a lift.
An antitwo-block override switch (item 41, page 4-3), maybe used to allow
closer approach of the hook block to the boom nose in special lifting
situations, and to obtain 35 feet maximum ground to inside hook height on
outriggers. The switch must be held in the OVERRIDE position to bypass the
system. Exercise extreme caution when overriding the antitwo-block/con-
trol lever lockout system.
2-42
