3.13 Lifting attachment.
The slings shall be equipped with forged-steel
hooks or eyes, rings, or prefer-med, h e a t - t r e a t e d steel plates for attaching to the
aircraft or component part being hoisted.
Simplicity in design shall be maintained
in the attachments to facilitate installation or removal.
Bolts, nuts, pins, et
cetera, required for attaching the sling to the section being hoisted shall be
formed into an integral part or securely attached to the lifting attachment.
When shackles are used for the lifting attachment, they
3 . 1 3 . 1 Shackles.
shall be of forged steel with removable, screw-type pins. The pins shall be
chained to the shackles.
3.14 Main body. The main body of slings shall consist of frame and built-up
s e c t i o n s , cables and fabric straps or webbing.
The main body shall be so designed
as to permit the optimum distribution of load to each lifting attachment.
3 . 1 4 . 1 Cables.
Unless otherwise specified, cable used in the construction of
slings shall be in accordance with MIL-W-83430, RR-W-41O or MIL-C-18375. The Chain
shall be of the welded type in accordance with RR-C-271.
*
3.14.2 Fabric straps and webbing. U n l e s s otherwise specified, fabric straps
or webbing used in the construction of slings shall be in accordance with
MIL-W-4088, MIL-W-5665, MIL-N-27265 or CCC-C-419.
*
3 . 1 4 . 3 S t i t c h i n g . The webbing shall be assembled using threads with
stitching as recommended as shown in Table No. II.
*
3 . 1 4 . 4 Seams. Complete and uninterrupted seams shall be used to secure
webbing.
For narrow webbing (less than 3 inches width) a box design may be used
while large webbing (3 inches or greater in width) will require a "W" type of
seam.
In each of these seams an extra seam shall be placed before and after the
complete box or "H" type seam.
*
3.14.5 Webbing and metallic assemblies. Since metallic components (shackles,
attaching hooks) present a hard surface to the webbing it is recommended that a
sleeve may be used for protection and Increase life. `In addition, the stated
minimum bend radius of the webbing shall not be exceeded and the thickness of the
assembly shall be Increased with spacers. A typical assembly is shown in
figure 2.
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