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|  MIL-S-29398C(MC)
*3.3.4 Coupling link. A coupling link shall serve as the inter-
face between each grab link and chain leg. the coupling links shall
be as specified in Drawing No. 825029A5000.
*3.3.5 Chain leg. The chain leg specified in Drawing No.
825029A4000 shall serve as the interface between the load to be
lifted and the coupling link specified in 3.3.4.
*3.4 Performance.
The sling system described-herein shall provide
capability to suspend and transport cargo internally beneath cargo
helicopters. The sling systems are used with single, dual point, or
rnultipoint suspension helicopters. Various numbers of lifting legs
may be configured to converge to single hooks or be separated in
various ways between fore, aft and center helicopter hooks.
3.4.1 Load capacity. The sling system (four legs) shall have a
safe working load of 40,000 pounds. Reducing the number of legs in
the rigged configuration reduces the maximum load capability of the
sling system in direct proportion to loss of legs. However, when
only leg is used in suspending the total load, the maximum allowable
single leg load may be increased by a factor of 1.4 to 14,000
p o u n d s . When rigged, the sling legs shall not exceed 45 dearees
from a verticle center line projected through the helicopter hook.
*3.4.2
Load strength. The sling system components shall sustain
up to the following loads in compliance with first article test and
production sampling requirements and shall conform with the quality
assurance requirements specified in Section 4.
Ultimate
Sling System
Safe
Breaking
Component
Reference
Working
Proof
Strength
Assemblies
Drawing
Load 1/ (lbs) Load 2/ (lbs)
Lead 3/ (lbs)
.
Apex Shackle 825029A1000
40,000
100,700
151,200
Subassembly
Sling
L e g 825029A2000
10,000
39,800
59,800
Grab
Link
825029A3000
10,000
39,800
59,800
Chain Leg
825029A4000
5,000
19,900
29,900
Coupling
825029A5000
5,000
19,900
29,900
Link
1/ Safe working load. Maximum load weight that component is
rated to lift.
2/ Proof load. Maximum working
tensile
load
of
component
during standard lifting operations.
3/ Ultimate breaking strength load. Maximum working tensile
load multiplied by a safety factor of 1.5.
4
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