MIL-DTL-25547C
3.24 Marking. Equipment assemblies and parts shall be marked for identification in accordance with
MIL-STD-130.
3.25 Workmanship. The loudspeaker shall be processed in such a manner as to be uniform in quality and shall be
free from defects that will affect life, serviceability or appearance.
4. VERIFICATION
4.1 Classification of inspections. Test and measuring equipment and inspection facilities of sufficient accuracy,
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quality and quantity to permit performance of the required inspection shall be established and maintained by the
contractor. The establishment and maintenance of a calibration system to control the accuracy of the measuring and
test equipment shall be in accordance with ISO 10012-1 and ANSI Z540-1. The inspection requirements specified
herein are classified as follows:
a. Materials inspection (see 4.2).
b. First article inspection (see 4.4).
c. Conformance inspection (see 4.5).
4.2 Materials inspection. Material inspection shall consist of certification supported by verifying data that aluminum
used in fabricating the loudspeaker conforms to SAE-AMS-QQ-A-250/2, Alloy 3003 or equivalent.
4.3 Inspection conditions. Unless otherwise specified, loudspeakers shall be tested under the following conditions:
Room ambient, +15°C (+59°F) to +35°C (+95°F ).
Temperature -
Pressure
-
Normal atmospheric.
Humidity
-
Room ambient up to 90 percent relative humidity.
All acoustical testing shall be made in a free field environment (see 6.3), or at the option of the contractor, the
testing may be performed using a non-anechoic test chamber, provided that the relationship between the results of
the free field tests and the results in the particular non-anechoic chamber is known and verified in a manner
acceptable to the procuring agency.
4.4 First article inspection. When specified (see 6.2), first article inspection shall be performed by the contractor,
after award of contract and prior to production, at a location acceptable to the Government. First article inspection
shall be performed on sample units, which have been produced with equipment and procedures normally, used in
production. First article approval is valid only on the contract or purchase order under which it is granted, unless
extended by the Government to other contracts or purchase orders.
4.4.1 Sample size. Six loudspeakers shall be subjected to first article inspection.
4.4.2 Inspection routine. The sample shall be subjected to the inspections specified in table IV, in the order shown.
All sample units shall be subjected to the inspections of group I. The sample shall then be divided equally into two
groups; one shall be subjected to the group II inspections, and the other shall be subjected to group III inspections.
4.4.3 Failures. Failures in excess of those allowed in table IV shall be cause for refusal to grant first article
approval.
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