3.12 Hoist attachment. The slings shall be provided with a hoist attachment
capable of supporting the required load and compatible to interface with the
hoisting unit. The hoist attachment shall be designed to be detachable for repair
or replacement. When assembled into a complete sling, the hoist attachment or
terminal ring of slings designed to support the complete aircraft shall have an
unobstructed aperture of sufficient size to accommodate a crane hook of trapezoidal
section with major dimensions and configuration as shown on Figure 1.
(See 6.8)
The maximum cross-sectional dimension of the ring shall not exceed 2-5/8 inches.
The hoist attachment used on aircraft component slings shall have a 3-inch minimum
i n s i d e clear opening for accepting the hoist.
The hoist attachments shall conform
t o the following:
FIGURE 1.
Trapezoidal section of crane hook
.
3 . 1 2 . 1 Rlnq-type attachments.
Ring-type hoist attachments for all types of
slings may be circular, pear, or oblong in shape and shall be forged or welded
s t e e l . The welded-type rings shall be accomplished under a closely controlled
process which will consistently produce welds of such quality as to provide
strength equivalent to at least 95 percent of that of the parent metal of the ring.
3 . 1 2 . 2 Plate-type attachments.
Plate-type hoist attachments may be used on
component slings only. Attachments of this type shall be properly heat-treated
to withstand the work loads and tests specified in Section 4.
3 . 1 2 . 3 Bar-type sling. When a bar-type sling is required, the hoist
attachment shall be designed to prevent the hoist from Interfering with the bar. A
forged-steel shackle or a ring and shackle shall be used for the hoist attachment.
7
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