MIL-PRF-49291D
TABLE II. Group A inspection.
Requirement
Inspection
Test paragraph
Applicable test document
paragraph
Visual and mechanical inspection
Attenuation rate
Type I
Type II
Measurement 2106
Attenuation uniformity
4.6.3 Group B inspection. Group B inspection shall consist of the inspections specified in table III.
Group B inspections shall be made on units that have passed the group A inspection. The maximum time
from the end of one group B inspection to the beginning of the following group B inspection shall be not
greater than 24 months.
4.6.3.1 Sampling plan. Group B inspections shall be performed on 100 percent of product covered by
each specification sheet.
4.6.3.2 Failures. Production units in which one sample unit has failed a group B inspection test shall
be rejected.
4.6.3.3 Rejected units. If a production unit is rejected, the supplier may screen out the defective units
of product (if possible), and resubmit for reinspection. Resubmitted production units shall be inspected
using tightened sampling. Such production units shall be separate from new production units, and shall
be clearly identified as reinspected production units.
4.6.3.4 Disposition of sample units. Sample units from which a specimen has failed any of the group B
inspections shall not be delivered on any order, even though the production unit submitted is accepted.
TABLE III. Group B inspection.
Requirement
Inspection
Test paragraph
Applicable test document
paragraph
Mode field diameter
TIA-455-167 or
Core diameter
Cladding diameter
Cladding ovality
3.5.1.2.5
4.7.2.1.5
Core ovality
Core-to-cladding offset
3.5.1.2.6
Coating diameter
Overall coating concentricity error
Material inspection
Numerical aperture
Cut-off wavelength
Tensile proof
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