MIL-PRF-87819B
4.3 Test equipment and inspection facilities. The supplier shall establish and maintain a calibration
system as specified in NCSL Z540.3, ISO-17025, or equivalent system as approved by the qualifying
activity.
4.3.1 System requirements. The calibration system requirements, including all parts necessary to
conduct the measurements of physical ear attenuation and ensure calibration of the system, shall be as
specified in ANSI S12.42.
4.4 Qualification inspection (see 6.3). Qualification inspection shall be performed at a laboratory
acceptable to the Government, on headset-microphone units produced with equipment and procedures
normally used in production.
4.4.1 Sample size. Ten (10) headset-microphone units shall be subjected to qualification inspection.
4.4.1.1 Disposition of samples. All ten headset-microphone units shall be returned to the
manufacturer. At least one unit that is assembled and one that is disassembled shall be retained by the
manufacturer as production standards.
4.4.2 Inspection routine. The samples shall be subjected to the inspections specified (see 3.1). All ten
samples shall be serialized and subjected to the inspections of subgroup I, prior to submittal to the
government laboratory. The results of subgroup I flat plate attenuation shall also be provided. The six
samples returned by the government laboratory shall be divided equally into two groups and subjected to
the inspections of subgroups II and III. Upon completion of these subgroups, three units selected at
random shall be disassembled and subjected to subgroup IV.
4.4.3 Failures. One or more failures in group I, group II, group II, or group IV (see 3.1) shall be cause
for failure of qualification.
4.5 Verification of qualification. Every 12 months the manufacturer shall provide verification of
qualification to the qualifying activity. Continuation of qualification is based upon meeting the following
requirements:
a. Design of the headset-microphone has not been modified.
b. Group A and group B inspection requirements are met.
c. Periodic group C inspection requirements are met.
4.6 Conformance inspection.
4.6.1 Inspection of product for acceptance. Inspection of product for acceptance shall consist of group
A and group B inspections (see 3.1).
4.6.1.1 Inspection lot. An inspection lot shall consist of all products of the same type, produced under
essentially the same conditions, and offered for inspection at one time.
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