MIL-PRF-49446B(CR)
4.4.2 Group inspections.
4.4.2.1 Group A inspection. Group A inspection shall be conducted on all (100 percent)
of the Detector-Dewars following successful inspection of 4.5.1 and preconditioning of 3.9.
Group A tests, listed in Table III, may be performed in any order except that Detector-Dewar
defects (3.5.1) shall be run last.
TABLE III Group A inspection.
Inspection
Requirement
Verification
paragraph
paragraph
Detector-Dewar defects
3.5.1
4.5.1
Detectivity
3.5.5
4.5.5
Responsivity
3.5.6
4.5.6
Detector resistance
3.5.7
4.5.7
Temperature sensors
3.5.8
4.5.8
Detector bias
3.5.10
4.5.10
Heat load
3.5.12
4.5.12
Microphonics
3.5.14
4.5.14
4.4.2.2 Group B inspection. Not required.
4.4.2.3 Group C inspection. Group C inspection shall be conducted on Detector-Dewars
selected from units which have passed the inspection in 4.4.2.1. The measurement and
verification of performance requirements 3.5.9, 3.5.13, 3.5.15 and 3.6.5 shall be performed on a
sample quantity (4.5.23.1) through the test requirements 4.5.9, 4.5.13, 4.5.15, and 4.6.5.
4.5.2.3.1 Sampling of group C inspection. The tests of 4.5.9, 4.5.13, 4.5.15 and 4.6.5
shall require 100 percent inspection of the entire lot for the failed attributes only, with continued
follow-on lots inspected until zero failures occur in any lot. Upon achieving zero failure at 100
percent inspection, follow-on lot inspection shall be conducted at 10 percent sampling.
Thereafter, upon achievement of zero failure during 10 percent samples, the sample rate shall be
lowered to 3 percent of the specified lot or one unit, whichever is larger. If one or more failures
occur during the 10 percent inspection sampling, the 100 percent inspection testing shall be
reinstituted.
4.4.2.3.2 Group C failures. Action required relative to group C failures shall be as
specified the contract or purchase order (see 6.2.).
4.4.2.3.3 Disposition of group C samples. Group C samples shall be accepted on
contract subsequent to successful completion of testing of Table III.
4.4.2.4 Group D inspection. Not required.
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