MIL-PRF-26542F
4.3.3 Failures. Failures in excess of those allowed in table I shall be cause for refusal to grant
qualification approval.
4.3.4 Verification of qualification. Every 12 (twelve) months the manufacturer shall provide verification
of qualification to the qualifying activity. Continuation of qualification is based on meeting the following
requirements.
a. The design of the microphone has not changed.
b. Group A and group B inspections.
c. Periodic group C inspection.
TABLE I. Qualification inspection.
Number of
Requirement
Test
sample units to
Number
Inspection
paragraph
paragraph
be tested
of failures
Group I
Visual and mechanical inspection
6
0
Sensitivity at ground level
6
0
Sensitivity at altitude
6
0
Frequency response at ground level
6
0
Frequency response at altitude
6
0
Impedance
6
0
Impedance limits
6
0
Distortion
6
0
Noise cancellation characteristics
6
0
Effect of external magnetic field
6
0
Stray magnetic field
6
0
Linearity
6
0
Talk-out
6
0
Dielectric withstanding voltage
6
0
Interchangeability
6
0
Group II
Thermal shock
3
0
Humidity
3
0
Drop
3
0
Pressure equalization
3
0
Explosive decompression
3
0
Salt fog
3
0
Group III
Vibration
3
0
Bounce
3
0
Altitude (nonoperating)
3
0
Moisture barrier
3
0
Immersion
3
0
Group IV
Fungus
3
0
Group V
Gun blast
3
0
Microphone bracket leakage
3
0
Boom finish
3
0
Boom operating force
3
0
9
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