MIL-DTL-16225C
3.8.4.2 Gun blastproof. The loudspeaker shall not be damaged when exposed (in addition to the
service blasts of 3.8.4.1) to 30 (thirty) service charge blasts of a 5-inch, 25- or 38-caliber gun. The unit
shall be located as specified in 3.8.4.1, except that the distance from the muzzle shall be 12 feet (for the
25-caliber gun) or 14 feet (for the 38-caliber gun).
3.9 Nomenclature and serial numbers. Nomenclature and serial numbers should be requested in
accordance with the procedures specified in MIL-DTL-21981.
3.10 Identification plates. Identification plates shall be in accordance with Drawing RE-C-49041.
3.11 Workmanship. Workmanship shall be such that the finished product shall meet all of the
requirements of this specification.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.1.1 Calibration of Inspection equipment. Test and measuring equipment and inspection facilities of
sufficient accuracy, 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 and NCSL-Z540.3.
4.2 First article inspection. Two first article samples shall be made and assembled by the
manufacturer with tools and methods that, as far as practicable, are the same as those which will be used
for quantity production of the product. The manufacture of the loudspeaker for a Government contract,
prior to approval of the first article sample, shall be at the manufacturer's risk.
4.2.1 General. First article samples shall be subjected to the examination and tests specified in table I.
TABLE I. First article inspection.
First article tests
Requirement
Test
paragraph
paragraph
Visual, dimensional and mechanical examination
incl., and 3.10
Input impedance
Insulation resistance
Frequency range
Power handling
Volume control
Acoustical efficiency
Distortion
Salt spray
Temperature cycling
Shock and vibration
Service and gunblast
Submergence
4.3 Conformance inspection.
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