MIL-DTL-0045585E (AR)
6.5 Automated acceptance inspection equipment. Equipment for which no, or
minimal, human involvement is required in the acceptance determination. This would
include equipment employing probes/sensors/transducers that are automatically
manipulated to perform measuring and detection functions. If readout is provided, the
equipment will be categorized as automated even if operator interpretation is needed in
the accept/reject decision.
6.6 Critical Inspection Equipment.
6.6.1 System Reliability. The contractor should provide for each defect identified
as Critical, a manufacturing and inspection system that assured no more than one in a
million contain the defect. This should be assured by controlling the maximum defect
rate produced and the error rate of the inspection equipment such that the product of the
two terms is less than one in a million.
6.6.2 Maximum defect rate produced. The maximum defect rate produced should
be defined as the largest defect rate expected for the characteristics of concern on a
monthly or lot basis. The contractor should establish the maximum defect rate, however,
it may not exceed one percent without approval of the procuring contracting officer.
Once established, the contractor should monitor the defect rate to assure it does not
exceed the maximum rate allotted. If the established maximum defect rate is exceeded,
the production of that feature should be terminated until the cause is determined and
corrected. Additionally, all products for that period of time should be rejected and
reinspected.
6.6.3 Maximum error rate of the inspection system. The error rate of the
inspection equipment should be defined as the expected ratio of the number of defective
parts accepted to the number of defective parts inspected by the equipment. The
contractor, to meet the system reliability as defined in contract, defines the maximum
error rate allowed. However, it may not exceed 1/500 without approval of the procuring
contracting officer. Based on the maximum error rate defined for the equipment, the
contractor should develop demonstration test procedure to demonstrate the error rate of
the equipment. The test should be performed using defective parts or reject standards.
No part or standard should be accepted during the test. If a part or standard is accepted,
the cause for failure should be isolated and the corrected and the test rerun. Unless
otherwise specified in the detailed item specification, the minimum number of test
samples to be run should be equal to 0.7 divided by the error rate (e.g. If the required
error rate is 1/1000, the sample size would be 0.7 divided by (1/1000) = 700.)
6.6.4 Periodic verification. Periodic verification of the system error rate should
be performed.
6.6.5 Redundant inspection equipment. The contractor may elect to use redundant
inspection equipment in lieu of using a single piece of equipment with a very low error
rate. Where redundant equipment is used, the inspection system error rate is defined as
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