OPERATIONAL AIDS - EMERGENCY PROCEDURES
When operational aids are inoperative or malfunctioning, the following requirements shall
apply for continued use or shutdown of the crane.
1. Steps shall be taken to schedule repairs immediately. The operational aids shall be put
back into service as soon as replacement parts, if required, are available and the
repairs and calibration can be carried out. “Can be carried out” does not mean, when
convenient. Every effort must be made to expedite the repairs and recalibration.
2.
When a load indicator, rated capacity indicator, or rated capacity limiter is inoperative
or malfunctioning, the designated person responsible for supervising the lifting
operations shall establish procedures for determining load weights. Loads with
unknown weights shall not be lifted without a properly functioning load indicating device.
3. When a boom angle or radius indicator is inoperative or malfunctioning, radii or boom
angle shall be determined by measurement.
4. When an anti-two-block device, two-blocking damage prevention or two-block
warning device is inoperative or malfunctioning, the designated person responsible for
supervising the lifting operations shall establish procedures, such as assigning and
additional signal person, to furnish equivalent protection.
5. When a boom length indicator is inoperative or malfunctioning, the designated person
responsible for supervising the lifting operations shall establish the boom length at
which the lift will be made by actual measurement or marking on the boom.
6. When a level indicator is inoperative or malfunctioning, other means shall be used to
level the crane.
► ANSI / ASME B30.5 Standard calls for the crane to be leveled within 1% or 0.6°.
► If there is no mechanical level on the crane, a 4 ft carpenter's level (on a machined
surface that would be parallel to the top of the swing bearing) is the generally
accepted substitute.
► Risk of overturning! Operation of the crane is only permitted when the crane is
aligned horizontally!
In certain situations, it may be necessary to override the automatic motion limiter of the
LMI / ATB unit in order to safely operate the crane. These include but are not limited to:
The load block may lift the ATB weight before the load line can be tensioned while stowing
the boom. This will cause a motion cutout. Overriding the system, in this situation is
acceptable in order to continue to winch in slack line, securing the boom. Boom must be in
the lowered position.
If the Boom Up/Down control joystick is pushed in up position after the boom is fully
raised, pressure will be trapped in the base of the main cylinder. This will cause a motion
cutout. Overriding the system is acceptable in order to boom down enough to release the
trapped pressure.
41P/N 12261-683 REVISED: January 2015
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