MIL-DTL-16225C
4.4.10 Non-operating temperature. The loudspeaker shall be subjected to the following non-operating
temperature cycle to determine conformance to 3.8.2.
a. With the loudspeaker set up for test in a temperature-controlled room, reduce room temperature to
62 degrees C and hold to within + 0 and 5 degrees C of that temperature, for at least 3 days.
b. Increase room temperature to + 70 ± 3 degrees C and maintain that temperature, for at least 4
hours.
c. Reduce room temperature to + 25 ± 2 degrees C and maintain that temperature, for at least 4
hours.
4.4.11 Service and gunblast tests. The loudspeaker shall be subjected to the service and gunblasts
specified in 3.8.4. When required (see 6.2), these tests will be performed upon units furnished by the
manufacturer.
4.4.12 Design tests. The bureau or agency concerned may authorize modifications of these tests as
may be necessary to suit this design and to guard against any weaknesses (noted in the first article
samples) being reflected in production units.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When actual packaging of materiel is to be performed by DOD or in-house
contactor personnel, these personnel need to contact the responsible packaging activity to ascertain
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activities within the Military Service or Defense Agency, or within the military service's system
commands. Packaging data retrieval is available from the managing Military Department's or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. Products delivered under this specification are intended for use in naval
communications receiving sets and associated audio frequency amplifiers.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a.
Title, number, and date of the specification.
b.
Whether service and gunblast tests are required (see 4.4.11).
c.
Packaging requirements.
First article inspection, when required (see 3.1).
d.
6.3 Tin whisker growth (see 3.7.9.1). The use of alloys with tin content greater than 97 percent, by
mass, may exhibit tin whisker growth problems after manufacture. Tin whiskers may occur anytime from
a day to years after manufacture and can develop under typical operating conditions, on products that
use such materials. Conformal coatings applied over top of a whisker-prone surface will not prevent the
formation of tin whiskers. Alloys of 3 percent lead, by mass, have shown to inhibit the growth of tin
whiskers. For additional information on this matter, refer to ASTM B545 (Standard Specification for
Electrodeposited Coatings of Tin).
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