Hooks.

TB 43-0142

(2) Reduction of rope diameter below normal value. The continued use of wire rope of

reduced diameter will cause sheave distortion; refer to Appendix C, paragraph C-2-a.(2) for criteria.

(3)

Worn outside wires; refer to Appendix C, paragraph C-2-a.(3) for criteria.

(4) Corroded, broken, or frayed wires at end connections; refer to Appendix C, paragraph

C-2.a.(4) for criteria.

(5) Corroded, cracked, bent, worn, improperly sized, or improperly applied end

connections.

(6)

Severe kinking, crushing, cutting, or un-stranding.

(7)

Evidence of damage due to welding arc or other heat sources.

(8) No less that two full wraps of rope remaining on the hook line drum is permitted when

the hook is in its extreme low position with the boom in its most upright position and the rope end is

securely attached to the drum by the clamp or socket arrangement approved by the crane or rope

manufacturer. The same limit applies to the boom hoist drum rope when the boom is in its extreme

low position.

f. Hooks.

(1) Inspect for cracks, throat opening of more than fifteen percent in excess of normal,

more than a 10 degree twist from the plane of the unbent hook, or wear exceeding ten percent of the

original dimensions. Remove hooks from service if they meet one or more of the above criteria.

(When original dimensions of hook are not known or when measuring devices are not available,

hooks having any visual evidence of an increase in throat opening, twisting, or deformation of any

sort will be removed from service.)

(2) Any questionable condition disclosed by visual inspection shall warrant the use of

magnetic particle or other suitable crack detection or inspection methods.

(3) Swivelling type hooks should rotate freely. Repair or alteration of hooks by welding or

reshaping is not recommended. Hooks shall have safety closure latches properly positioned and

functional, except when the use of a hook with a safety closure may create additional hazards in

operations. In these instances, the local commander may give written approval to deviate from this

requirement. This approval should be reviewed annually to ensure that the need for the deviation is

still valid.

(4) Hooks shall not be painted. Paint will cover small stress cracks from metal fatigue due

to repeated usage. New hooks shall have all paint removed prior to being placed in service.

g. Hoist Chains. Perform documented inspection of hoist chains for excessive wear, twist,

distorted links, or stretch beyond manufacturer's recommendations. Refer to Appendix C, paragraph

C-2-b., for criteria.

A-4. Tests. When required by paragraph 4a, perform a functional test to determine operability of

the equipment. Functional testing shall consist of lifting a characteristic load (determined locally),

holding it at an appropriate height for one minute, maneuvering it in a manner which will simulate the

operation of the lifting device in the working environment, and towering it to its original position. For

lifting devices used to handle hazardous materials, conduct the function test as above, using an inert

item equal in weight to or heavier than (not to exceed the manufacturers load rating of the device)

the heaviest item normally lifted by the devices as its characteristic load. A visual inspection will be

performed prior to and after functional test is performed. Record pretest and post-test findings,

actions taken, and test date in the end item's historical records.

A-5. Standby Cranes. Cranes used for standby service shall be inspected at least semi-annually

in accordance with the criteria in paragraph A-3. Such cranes which are exposed to adverse

environment should be inspected more frequently.

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