MIL-DTL-28837C
TABLE III. Group A inspection.
Inspection
Requirement paragraph
Test method paragraph
Subgroup I (screened and unscreened samples)
Visual and mechanical examination------------------------------
Seal ---------------------------------------------------------------------
Electrical characteristics 1/ ----------------------------------------
Conversion loss -----------------------------------------------------
---
Noise figure ----------------------------------------------------------
---
Isolation ---------------------------------------------------------------
---
Conversion compression -----------------------------------------
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Conversion desensitization --------------------------------------
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Intermodulation------------------------------------------------------
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Insertion loss---------------------------------------------------------
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VSWR -----------------------------------------------------------------
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RF leakage -----------------------------------------------------------
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Subgroup 2 (screened samples only)
Thermal shock ---------------------------------------------------------
3.8
Vibration -----------------------------------------------------------------
Seal ----------------------------------------------------------------------
Electrical characteristics 1/ --------------------------------------
Radiographic inspection 2/------------------------------------------
Acceleration 2/--------------------------------------------------------
1/ As applicable (see 3.1).
2/ Additional screening requirement for space flight mixers.
4.6.1.2.1 Sampling plan. Statistical sampling and inspection shall be performed on an inspection lot basis with a
random sample of mixers selected in accordance with table IV. Acceptance levels shall be based upon the zero
defective sampling plan. No failures shall be permitted.
TABLE IV. Group A sampling plan.
Lot size
Sample size
Space flight mixers
1-
13
100 percent
100 percent
14 -
150
13
100 percent
151 -
280
20
100 percent
281 -
500
29
100 percent
501 - 1,200
34
100 percent
1,201 - 3,200
42
100 percent
3,201 - 10,000
50
100 percent
10,001 - 35,000
60
100 percent
35,001 - 150,000
74
100 percent
150,001 - 500,000
90
100 percent
500,001 and over
102
100 percent
4.6.1.2.2 Rejected lots. If an inspection lot is rejected, the contractor may rework it to correct the defects, or
screen out the defective units, and resubmit for reinspection. Resubmitted lots shall be inspected using tightened
inspection, defined as double original sample size with acceptance on zero failures. If tightened inspection fails, the
rejected lot shall not be re-inspected, re-screened, or reworked. All rework shall be performed prior to re-inspection.
Resubmitted lots shall be separate from new lots, and shall be clearly identified as reinspected lots.
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