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1. A / D director: (Assembly/Disassembly director) means an individual who meets the
subparts requirements for an A/D director, irrespective of the person's formal job title or whether the
person is non management personnel.
2. Articulating Crane: Means a crane whose boom consists of a series of folding, pin
connected structural members, typically manipulated to extend or retract by power from hydraulic
cylinder
3. Assembly/Disassembly: Means the assembly and/or disassembly of the equipment covered
under this standard. With regards to tower cranes, erecting and climbing replaces the term
"assembly", and "dismantling". Regardless of whether the crane is initially erected to its full height or
is climbed in stages, the process of increasing the height of the crane is an erection process.
4. Assist crane: means a crane used to assist in assembling or disassembling a crane.
5. Attachments: means any device that expands the range of tasks that can be done by
the equipment Examples include , but are not limited to : An auger , drill , magnet , pile - driver
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, and boom - attached personnel platform .
6. Audible signal: means a signal made by a distinct sound or series of sounds . Examples
include , but are not limited to , sounds made by a bell , horn , or whistle .
7. Blocking: ( also referred to as " cribbing " ) is wood or other material used to support
equipment or a component and distribute loads to the ground . It is typically used to support lattice
boom . sections during assembly disassembly and under outrigger and stabilizer floats .
8. Boatswain's chair: means a single - point adjustable suspension scattold consisting of a
seat or sling ( which may be incorporated into a full body harness ) designed to support one
employee in a sitting position .
9. Boom angle indicator: Boom means a device which measures the angle of the boom
relative to horizontal .
10. Boom hoist limiting device: limiting includes boom hoist disengaging device boom
hoist shut - off , boom hoist disconnect boom hoist hydraulic relief , boom hoist kick - outs , automatic
boom stop device or derricking limiter . This type of device disengages boom hoist power when the
boom reaches a predetermined operating angle
. It also sets brakes or closes valves to prevent the boom from lowering after power is disengaged .
11. Boom length indicator: indicates the length of the permanent part of the
boom ( such as ruled markings on the boom ) or , as in some computerized systems , the length of
the boom with extensions / attachments
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