MIL-DTL-25547C
TABLE IV. First article inspection.
Acceptable
Number
number of
of units to
Method
Examination or test
Requirement
defects
be
paragraph
paragraph
permitted
inspected
Group I
0
6
4.6.1
3.2, 3.3,
Visual and mechanical examination
3.24 and 3.25
0
6
4.6.2
3.4
Voice coil impedance
0
6
4.6.3
3.5
Voice coil polarity
0
6
4.6.4
Stray magnetic field
3.6
0
6
4.6.5
Sensitivity
3.7
0
6
4.6.6
Frequency response
3.8
0
6
4.6.7
Directional characteristics
3.9
0
6
4.6.8
Linearity
3.10
0
6
Distortion
4.6.9
3.11
0
6
Acoustic quality
4.6.10
3.12
0
6
Dielectric withstanding voltage
4.6.11
3.13
Group II
0
3
4.6.12
3.14
Life
0
3
4.6.13
3.15
Endurance
0
3
4.6.14
3.16
Temperature cycling
0
3
4.6.15
3.17
Vibration
0
3
4.6.16
3.18
Shock
Group III
0
3
4.6.17
3.19
Pressure cycling
0
3
4.6.18
3.20
Explosive decompression
0
3
4.6.19
3.21
Humidity
0
3
4.6.20
3.22
Fungus
0
3
4.6.21
3.23
Salt fog
4.5 Conformance inspection.
4.5.1 Inspection of product for delivery. Inspection of product for delivery shall consist of groups A and B
inspections.
4.5.1.1 Inspection lot. An inspection lot shall consist of all loudspeakers produced under essentially the same
conditions, and offered for inspection at one time.
4.5.1.2 Group A inspection. Group A inspection shall consist of the examination and tests specified in table V in the
order shown.
4.5.1.2.1 Sampling plan. Accept on zero, for general inspection level II, as specified in table VI. The classification
of defects for the visual and mechanical examination is specified in table VIII.
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