MIL-DTL-23581B(SH)
4.3.1 First article sample. Prior to the start of production and within 30 days after the date of award of the
contract or order, one machine of each design and size shall be made ready for approval of the contracting officer or
his authorized representative to conduct the tests and examinations specified in table I and 4.3.2 and 4.3.3 (see 6.3).
Approval of the tested sample by the contracting officer or his authorized representative shall not relieve the supplier
of the responsibility of compliance with the requirements of this specification. Disposition of first article sample
shall be in writing at the direction of the contracting officer or designated representative (see 6.2).
4.3.2 Contractor tests. Prior to the submission of the first article sample for inspection, the manufacturer shall
subject the machine to the test of 4.3.3.9 (see 6.3).
4.3.3 Inspection tests.
4.3.3.1 Disassembly. Prior to conducting the inspection tests the sample machine shall be disassembled to the
extent required and the component parts passed through a 30-inch diameter by 60-inch long cylinder. Machine shall
then be reassembled for testing.
4.3.3.2 Inclination. The machine shall be inclined and operated at an angle of 30 degrees to each side of two
vertical planes at right angles to each other. The machine shall operate satisfactorily in each of the four positions.
4.3.3.3 Vibration tests. The machine shall be tested without packaging or crating.
4.3.3.3.1 Vibration testing. The drying tumbler under full load conditions shall be subjected to Type I vibration
test in accordance with MIL-STD-167-1, except the variable frequency tests are not required.
4.3.3.4 Airborne noise and structureborne vibration. Unless otherwise specified, the airborne noise and
structureborne vibration acceleration testing shall be conducted in accordance with MIL-STD-740-1 and MIL-STD-
740-2, respectively. The unit shall be tested on a single layer of Distributed Isolation Material (DIM) mount,
designed in accordance with guidance provided by NSWCCD Code 9840, in lieu of the low frequency resilient
mounts described in 5.5.1 of MIL-STD-740-1 and 5.6.1 of MIL-STD-740-2.
4.3.3.5 Shock testing (Type I only). One configuration of the drying tumbler being qualified shall be subjected
to a shock test in accordance with MIL-S-901 as follows:
a.
Shock grade
-
Grade B
b.
Equipment class
-
Class I
c.
Test category
-
Medium weight
d.
Shock test type
-
Type A
Any part of drying tumbler coming adrift or separating from tumbler constitutes
e.
Failure definition
-
failure of test.
Drying tumbler mounting location, plane, and orientation for testing on the test
f.
Mounting
-
fixture shall simulate the most severe mounting condition likely encountered in an
actual shipboard installation as recommended by the contractor and approved by
the accepting government authority.
g.
Mode
-
Equipment shall not be energized or operating during test.
h.
Disposition
-
Equipment to be disposed by contractor, and not delivered as part of this contract.
i.
Quantity for test
-
1 each
4.3.3.6 Drying efficiency. Test cloths shall be prepared from a white cotton fabric of uniform texture and
permanent finish, having a warp of 48, a weft of 48, and weighing not less than 0.33 pound per square yard.
Permanent finish, sanforized, white cotton cloth, known as Indianhead cloth may be used. The test cloths shall be
cut to 24 by 36 inches and shall be double-hemmed to a finished size of 22 by 34 inches. A test load shall consist of
16 pounds dry weight of test cloths soaked with water to a wet weight of 150 percent of the dry weight. The dry
weight of test cloths shall be determined at a temperature of 70±2 °F. An average of 10 runs shall be used to
evaluate the drying efficiency of the machine (see 3.7.1). The ambient conditions where the tests are to be
conducted shall be 75±10 °F and 60±20 percent relative humidity.
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