MIL-DTL-62567D(AT)
TABLE VI. Group B sampling plan.
Sample Size
Lot Size
For Major
For Minor
Characteristics
Characteristics
2 to 13
Entire lot
3
14 to 25
13
3
26 to 50
13
5
51 to 90
13
6
91 to 150
13
7
151 to 280
20
10
281 to 500
29
11
501 to 1200
34
15
1201 to 3200
42
18
3201 to 10 000
50
22
NOTE: Accept lot on zero defects.
Reject lot on one or more defects.
6.4.1.2 Reduced inspection. Reduced inspection may be introduced when 10 successive
lots have been accepted and should as a maximum, permit a 30 percent decrease in sample size.
Normal inspection sampling should be restored if a lot is not accepted under reduced inspection.
6.4.2 Statistical process control (SPC). Sampling plan requirements may be satisfied
through the use of SPC as an alternate control method. If SPC is to be used, an SPC plan,
detailing the methods for monitoring process control, should be approved by the Government or
agent. The plan, developed by the contractor, should include as a minimum:
a.
Types of control charts and their uses.
b.
Process capability (Cpk) studies.
c.
Criteria for determining out-of-control conditions.
d.
Corrective actions to be taken if an out-of-control or out-of-tolerance condition is
detected.
e. Training programs and qualification requirements of personnel executing the plan.
f. Provisions for reduced inspection.
The plan should contain the results of process capability studies for the processes being
controlled. For variable data, the minimum Cpk for statistical control should be 1.33. For
attribute data, a minimum process average of 99.73% is required.
6.5 Shot peening. In order to meet the endurance requirements of 3.2.5, previous
manufacturing processing has included shot peening in accordance with SAE AMS 2430 as
follows:
a. The torsion bar was shot peened before and after preset except that the intensity was
0.007C to 0.010C on the body and not less than 0.012A on the splines.
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