MIL-DTL-81963C
4.6.3.5 Qualification approval by analogy. When a manufacturer seeks approval at any one time for
two or more types of any one class of servocomponent of the same frame size, he may apply for
qualification approval on the basis of group submission subject to approval by the qualifying activity. All
four units of each type shall be subjected to the full range of conformance tests. The types shall then be
grouped in the manner specified in the applicable general specification and a full test sample of four units
shall be selected from each group. This test sample shall be subjected to the remaining qualification
approval tests (i.e., one sample of four units shall be fully tested as representing each group). Failure of
a test sample shall be cause for withholding approval of the group which it represents. Sample
substitution shall not be permitted.
4.6.4 Disposition of qualification sample. Servocomponents subjected to qualification inspection shall
not be delivered on any contract or order.
4.6.5 Requalification. In order to retain qualification approval, qualification inspection shall be
performed every 24 months or as directed by the qualifying activity.
4.7 First article sample inspection. When a source for a qualified product is not available and first
article inspection is required by the procuring activity, sample servocomponents shall be subjected to the
4.7.1 First article sample failure. Failure of any servocomponent in any test shall be cause for refusal
to grant first article sample approval.
4.8 Conformance inspection. The examination and tests comprising conformance inspection are
classified in table I and any other tests peculiar to the particular servocomponent, which are listed in the
Qualification and Conformance Inspection Tests table of the applicable general specification.
4.8.1 Conformance inspection sampling plan. A sample of parts shall be randomly selected in table III.
If one or more defects are found, the lot shall be rescreened and defects removed. After screening and
removal of defects, a new sample of parts shall be randomly selected in table III. If one or more defects
are found in the second sample, the lot shall be rejected and shall not be supplied to this specification.
4.8.2 Conformance inspection routine. The minimum of inspection to be verified by the government
inspector shall be the applicable tests in table I and the dimensional and visual requirements as indicated
on the outline drawing in the applicable documents and the specification sheet that cite MIL-DTL-81963
as a direct reference.
4.9 Test methods and examinations.
4.9.1 Visual and mechanical examination. The servocomponent shall be examined to verify that the
materials, design, construction, physical dimensions, marking, and workmanship are in accordance with
4.9.2 Shaft radial and end play.
4.9.2.1 Shaft radial play. The servocomponent shall be mounted rigidly with the shaft horizontal. A
dial gauge shall be applied to the shaft as close to the bearing face as possible. A load of the value
specified in figure notes of either the applicable general specification or documents and the specification
sheet that cite MIL-DTL-81963 as a direct reference shall be applied perpendicular to the shaft within 0.25
inch of the end of the shaft, and in a horizontal plane, first in one direction and then in the opposite
direction. The difference between the two dial gauge readings shall be taken as the shaft radial play.
The shaft radial play shall not exceed the allowable shaft radial play specified in accordance with 3.6.2.
4.9.2.2 Shaft end play. The servocomponent shall be mounted rigidly with the shaft horizontal. A dial
gauge shall be applied to the end of the shaft. A load of the value specified in figure notes of either the
applicable general specification or applicable documents and the specification sheet that cite MIL-DTL-
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