3.7 Part numbering o f interchangeable parts. All parts having the same
manufacturer's part number shall be functionally and dimensionally interchangeable
The item identification and part number requirements of DOD-STD-100 Shall govern
the manufacturer's part numbers and changes thereto.
3 . 8 Design and construction.
The slings shall be designed to support the
specified aircraft or component part being hoisted and shall not interfere with or
contact the part being hoisted at areas other than points of attachment. Unless
o t h e r w i s e specified, the design shall include a provision of adjustment for varying
center of gravity locations of the hoisted items for improved stability during
h o i s t i n g and limited transportation.
The dimensions of slings shall be kept to a
minimum consistent with design requirements.
F o r aircraft hoisting slings, the
maximum vertical height of the sling hoist attachment shall not exceed 24 feet or
as otherwise specified when the aircraft Is hoisted just clear of the ground with
gears down.
3 . 8 . 1 Rated load. The rated load shall be the maximum load for which the
slings are designed to handle. The term rated load or capacity Is the same as the
Safe Working Load (SWL). Those terms or loads shall not include the factor of
safety and are the loads or forces applied under actual working conditions. The
rated load is the maximum permissible applied load.
3 . 8 . 2 Design requirements. The design of the slings shall eliminate all
unnecessary weight and shall reflect a constant effort toward weight-strength
The stress level, under load condition, at any point in the
optimization.
structure shall be limited to a level that provides a safety factor of 3 against
permanent deformation. When dynamic factors induce loads that exceed 1.5 times the
rated load, the stress level at any point in the structure shall be limited to a
level that provides a safety factor of 2 against permanent deformation induced by
dynamic loads. Bolts, rivets, pins and all other attachment devices shall be
designed to include a safety factor of 5 based on ultimate strength. The design of
steel cables and fabric straps shall include a safety factor of 5 based on the
breaking strength of the cable or strap. The sling assembly shall be capable of
withstanding a static proof load of 200 percent of the rated load. In addition,
fabric straps or webbing designed for use as bellyband slings shall be of
sufficient width and softness to provide an even distribution of the load to the
straps to prevent the straps from damaging the thin skinned surfaces. For those
slings used for transporting cargo below a helicopter the frontal area of this
cargo shall be calculated In accordance with Appendix A of MIL-STD-209. The maximum
shipping weight and sling length shall also be calculated in accordance with
MIL-STD-209.
3 . 8 . 3 S a f e t y . The slings shall be so constructed and assembled as to
w i t h s t a n d all conditions of service use without loss or loosening of parts,
p e r m a n e n t deformation or loss of serviceability. The slings shall be designed
to provide for servicing and use by personnel wearing heavy gloves, mittens, bulky
clothing and chemical defense ensembles. Hazards that cannot be eliminated or
c o n t r o l l e d through design selection shall be controlled to an acceptable level
through use of fixed, a u t o m a t i c , or other protective safety design features or
A proof load test shall be required for each sling assembly.
devices.
3 . 8 . 4 I n t e r f a c e c a p a b i l i t y . The slings shall provide an Interface
c a p a b i l i t y with the following items:
a.
H o i s t i n g unit as specified In 3.12 herein.
b.
Aircraft or component part as specified In Table I.
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