MIL-DTL-151F
4.
VERIFICATION.
4.1 Preproduction sample. Each preproduction sample tested for approval shall successfully pass the examination
and tests specified in 4.4 (see 6.3). Production units shall be identical to the preproduction sample as approved.
4.2
Sampling for conformance inspection.
4.2.1 Lot. For purposes of sampling, a lot shall consist of all electric fans of the same class and type offered for
delivery at one time.
4.2.2 Sampling for group A examination and tests. A random sample of fans shall be selected from each lot and
shall be subjected to each of the group A examination and tests specified in 4.3.1, with lot acceptance based on
acceptance number equal zero.
Table II. Sampling for group A tests.
Number of fans in
Number of fans in
lot
sample
2 to 8
6
9 to 15
8
16 to 25
10
26 to 40
13
41 to 65
17
66 to 110
22
111 to 180
28
181 to 300
35
301 to 500
45
501 and over
55
4.2.3 Sampling for group B test. A sample number of fans shall be selected in accordance with table III from
the end of each month's production and shall be subjected to the group B test specified in 4.3.2.
Table III. Sampling for group B tests.
Number of fans in 1 month's
Number of fans to be
production
selected for group B tests
65 and under
1
66 to 300
2
301 to 800
3
4.3
Conformance inspection.
4.3.1 Group A examination and tests. Each of the sample fans selected in accordance with table II shall be
subjected to the examination and each of the tests specified herein and the results of the examination and each test
compared with requirements of this specification. Failure to conform to the requirements of this specification for any
group A examination and tests shall be counted as a defect, and the fans shall not be offered for delivery.
Group A examination and tests
Reference
Visual examination ....................................
4.4.1
Insulation resistance (cold) ...........................
4.4.2
Speed ....................................................
4.4.3
Power input .............................................
4.4.4
Dielectric strength ......................................
4.4.5
7
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