MIL-DTL-83425A
4.3.2 Report. When specified by the procuring activity (see 6.2), a first article test report shall be
prepared and submitted, as specified in the contract or purchase order. The first article test report shall
list each failure that occurred during the first article tests, shall specify the degree to which the limit was
exceeded, how the failure was corrected, and the steps taken to avoid repetition of the failure. The
preparer of the report may refer to military handbook titled "Preparation of Test Reports"(see 6.4), for
additional information.
4.4 Conformance inspection. The conformance inspection shall consist of the following:
a. Individual tests.
b. Sampling tests.
4.4.1 Individual tests. Each earcup shall be subjected to the examination of product described in 4.5.1.
4.4.2 Sampling tests. One complete earcup shall be selected at random from each lot of 500 (five
hundred), or fraction thereof, and shall be subjected to the mechanical stability test described in 4.5.2.
4.4.2.1 Rejection and retest. If one or more items from a lot fail to meet this specification, acceptance
of all items in the lot shall be withheld until the extent and cause of failure have been determined. The
contractor shall explain fully to the Government representative and notify the procuring activity in writing
the cause of failure, the action taken to preclude recurrence, and the impact this failure may have in
scheduled deliveries. After correction, all of the sampling tests shall be repeated.
4.4.2.2 Individual tests may continue. For production reasons, individual tests or other sampling plans
may be continued pending the investigation of a sampling test failure. Final acceptance of the entire lot
or lots produced later shall not be made until it is determined that all items meet all the requirements of
this specification.
4.4.3 Defects in items already accepted. The investigation of a test failure could indicate that defects
may exist in items already accepted. If so, the contractor shall fully advise the procuring activity of all
defects likely to be found and the method of correcting them.
4.5 Test methods
4.5.1 Examination of product. The earcup shall be examined for conformance to this specification, with
respect to materials, design, construction, dimensions, marking, and workmanship.
4.5.2 Mechanical stability. The earcup shall be subjected to a temperature of -40° Fahrenheit for a
minimum of 2 (two) hours. Within 1 (one) minute after removal of the earcup from the temperature of -40°
Fahrenheit, the earcup shall be dropped, from a height of 6 (six) feet, onto an uncovered concrete floor.
The earcup shall then be examined for cracks and chips (see 3.5.1).
4.5.3 Sound attenuation. The attenuation of the earcup shall be measured conforming to ANSI S12.6.
The attenuation requirements specified shall be demonstrated, at each frequency listed in table I, to
determine conformance to the requirements specified in 3.5.2. The pressure required against the
subject's head to attain the attenuation specified in table I shall not exceed 3 pounds. An H-143/AIC
earphone conforming to MIL-PRF-25670/2 or a simulated equal mass shall be installed in the earcup
during the sound attenuation test. The communication cord opening in the earcup shall be plugged
during the sound attenuation test.
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