MIL-DTL-24251F
4.4.1.3.1 Sampling plan. Statistical sampling and inspection shall be performed on an inspection lot basis with a
random sample of components selected in accordance with table II. The acceptance levels shall be based upon the
zero defective sampling plan. No failures shall be permitted.
TABLE II. Group A sampling plan.
Lot size
Sample size
1-
13
100 percent
14 -
150
13
151 -
280
20
281 -
500
29
501 - 1,200
34
1,201 - 3,200
42
3,201 - 10,000
50
10,001 - 35,000
60
35,001 - 150,000
74
150,001 - 500,000
90
500,001 and over
102
4.4.1.4 Group B inspection. Group B inspection shall consist of the inspections specified in table III, in the order
shown, and the sample shall be selected from inspection lots that have passed group A inspection. NOTE: If the
following group B tests have previously been performed by the tube shield manufacturer, and if the material,
manufacturing process, and test requirements are the same as when these tests were initially performed, the subject
test(s) need not be performed again.
TABLE III. Group B inspection.
Requirement
Method
Test
paragraph
paragraph
Heat resistance - - - - - - - - - - - - - - - - - - - - - - - - - -
Heat dissipation - - - - - - - - - - - - - - - - - - - - - - - - -
Permeability - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Installation and removal - - - - - - - - - - - - - - - - - - - -
Salt atmosphere (corrosion) - - - - - - - - - - - - - - - - -
Electrical contact - - - - - - - - - - - - - - - - - - - - - - - - -
Installation, locking and unlocking torque or load,
and removal force - - - - - - - - - - - - - - - - - - - - - - -
Initial force at 25°C - - - - - - - - - - - - - - - - - - - - -
Force at temperature extremes - - - - - - - - - - - - -
Fatigue - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Vibration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Shock - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
4.4.1.4.1 Sampling plan. Sample units shall be selected from tube shields, retainers (bases), or adapters that
have passed group A inspection. Two sample units shall be selected and tested every 24 months. The period shall
start the date the last test was satisfactorily completed on each of the individual units and run for 24 months.
4.4.1.4.2 Test routine. Group B inspection shall be performed at the start of production, and each 24-month period
thereafter. If production of a particular shield, retainer (base), or adapter has been suspended for 24 months or more,
group B inspection shall be again required at the time production is started. In such a case, inspection shall be
performed on sample units selected from the first lot of the new production presented for acceptance, and after each
subsequent 24-month period.
4.4.1.4.3 Acceptance criteria. No failures shall be permitted.
4.4.1.4.4 Disposition of sample units. Sample units which have been subjected to group B inspection shall not be
delivered on contract or order.
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