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|  MIL-S-4040F
4.5.3 Failures. One or more failures shall be cause for refusal to grant first article approval.
4.6 Conformance inspection.
4.6.1 Inspection lot. An inspection lot shall consist of one week's production of solenoids of the same design,
materials, and production processes, produced under essentially the same conditions and offered for inspection at
one time. Where production is less than 200 solenoids per week, a lot shall consist of two consecutive weeks
production. The date code shall indicate that the solenoids were produced during the first week.
4.6.2 Group A inspection. The group A inspection shall consist of the inspection specified in table III, in the order
shown.
TABLE III. Group A inspection.
Inspection
Requirement
Method
paragraph
paragraph
Subgroup 1
Dielectric withstanding voltage
3.5.3
4.7.4
Subgroup 2
DC coil resistance
3.5.1.6
4.7.2.6
Coil current
3.5.1.5
4.7.2.5
Compensated actuating voltage
3.5.1.2
4.7.2.2
Insulation resistance
3.5.2
4.7.3
Visual and mechanical examination
3.1, 3.4, 3.5,
4.7.1
3.8, and 3.9
Deactuating voltage (when specified)
3.5.1.3
4.7.2.3
Operate and release time (when
3.5.1.4
4.7.2.4
specified)
4.6.2.1 Sampling plan.
4.6.2.1.1 Subgroup 1. All solenoids offered for inspection shall be subjected to the dielectric withstanding voltage
test. Lots having more than five percent total rejects shall not be furnished on the contract. Solenoids out of
specification limits shall not be shipped with the lot.
4.6.2.1.2 Subgroup 2. A sample of parts shall be randomly selected in accordance with table IV. If one or more
defects are found, the lot shall be rescreened and the defective parts removed. A new sample of parts shall then be
randomly selected in accordance with table IV. If one or more defects are found in the second sample, the lot shall
be rejected and shall not be supplied to this specification.
TABLE IV. Group A, subgroup 2 inspection sampling plan.
Visual and mechanical
Lot size
Electrical characteristics
inspection
(number of sample units) 1/
Major
Minor
2- 8
all
100 percent
3
9 - 15
all
13
3
16 - 25
20
13
3
26 - 50
20
13
5
51 - 90
20
13
6
1/ Electrical characteristics shall include coil resistance, coil current, and
compensating actuating voltage.
8
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