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Parachute suspension provisions. |
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|  MIL-S-52986(ME)
4.5.2.6 Parachute suspension provisions. The parachute suspension provisions
shall be demonstrated to prove conformance to 3.19.1. Apply a force of 1.5
times the limit load as specified in MIL-STD-814 to each of the parachute
suspension provisions. Weld failure or permanent deformation of the scaper or
suspension provisions shall constitute failure of this demonstration.
4.5.2.7 Sling provisions. The slinging provisons shall be demonstrated
to prove conformance to 3.19.2. Nonconformance to 3.19.2, weld failure, or
permanent deformation of the scraper or the slinging provisons shall constitute
failure of this demonstration. The demonstration procedure shall be as follows:
Lift the scraper and bold in suspension in its normal travel position
(a)
using slings that converge not more than 24 feet above the lowest
extremity of the scraper. Spreader bars are permitted. Determine
the force and angles of application for each provison. Measure the
clearance between each sling and the scraper.
Restrain the scraper by anchoring the main frame and subject each
(b)
slinging provision to a force equal to the working load specified
in MIL-STD-209. This force shall be applied in the direction as
determined in (a) above. Hold each load for aminimum of 90 seconds.
Repeat (a) and (b) above for each section of the type II scraper.
(c)
4.5.2.8 Tiedown provisions. The tiedown provisions shall be demonstrated to
prove conformance to 3.19.3. Apply a force equal to the limit load as specified
in MIL-STD-814 to each of the tiedown provisions. Weld failure or permanent
deformation of the scraper or the tiedown provisions shall constitute failure of
this demonstration.
4.5.2.9 Extraction prachute provison. The extraction parachute provision
shall be demonstrated to prove conformance to 3.19.4. Apply a force equal to
1.5 times the limit load specified in 3.19.4 to t-he provision. Weld failure or
permanent deformation of the scraper or the extraction parachute provison shall
constitute failure of this demonstration.
4.5.2.10 Construction task. The scraper shall be demonstrated as follows for
a total of 40 hours to prove conformance to 3.9 and 3.10.3: self-load, hauls
dump and spread undisturbed or recompacted soil. The haul distances shall be at
least 1500 feet. Record the time required for self-loading to heaped capacity
at least 5 times. All lighting shall remain on throughout this demonstration.
Nonconformance to 3.9 and 3.10.3 or any malfunction or breakage of mechanical or
electrical components shall constitute failure of this demonstration.
4.5.2.11 Airdrop. The scraper shall be subjected to simulated airdrop impact
demonstration in accordance with MIL-STD-669 to prove conformance to 3.19. This
demonstration will be conducted by the Government at a Government facility;
however, acceptance of the preproduction models will be dependent on the
successful completion of this demonstration. The demonstration shall consist of
the following:
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