MIL-DTL-81963C
4.4 Mounting fixtures. Unless otherwise specified herein or in the applicable general specification,
each test shall be conducted with the servocomponent mounted on a standard test fixture. See figure 3
or figure 4, as appropriate.
4.5 Electrical test load condition. Unless specified herein or in the applicable general specification, the
servocomponent under test shall not be electrically loaded.
4.6 Qualification inspection. Qualification inspection shall be performed in accordance with the
applicable documents and the specification sheet that cite MIL-DTL-81963 as a direct reference, at a
laboratory approved by the qualifying activity.
4.6.1 Qualification sample. A sample shall consist of six servocomponents of the same type, for which
approval is requested. The sample or samples submitted for qualification approval shall be
representative of normal production. Four servocomponents shall be selected for the qualification
approval sample and two shall be held in reserve against need, as directed by the qualifying activity.
4.6.2 Qualification inspection routine. The sample shall be subjected to the tests and examinations in
table I, by the sample number shown for individual units within the sample. Qualification inspection shall
also include any other tests peculiar to that type servocomponent and shall be performed in the sequence
listed under the Qualification and Conformance Inspection Table, as specified in the applicable general
specification.
4.6.3 Assessment of qualification approval test results.
4.6.3.1 Qualification sample failure. A servocomponent shall be regarded as having failed a particular
test either if catastrophic physical damage occurs or if the performance of the servocomponent is outside
the limits specified in the applicable general specification. The failure of any one servocomponent of the
qualification approval sample shall be sufficient cause for withholding qualification.
4.6.3.2 Qualification sample isolated failure. If it is determined by the qualifying activity that a
catastrophic failure is considered to be truly isolated in nature, one substituted new servocomponent may
be permitted per test sample. This substituted unit must pass all tests to the point of original failure as
well as succeeding tests required by the applicable general specification. A second failure shall be cause
for rejection of the sample.
4.6.3.3 Degradation of performance. The environmental tests to which servocomponents are
subjected impose upon them conditions representing the extremes of those likely to be encountered in
service. Therefore, under qualification inspection, some small degradations of performance may occur
which would be unlikely to arise in service and would not impair the performance of the equipment.
Allowable minor degradations following environmental tests are as specified in the applicable general
specification.
4.6.3.4 Major failures during or following environmental tests. On the occurrence of failures beyond
those permitted by the applicable general specification, the qualifying authority may, at its discretion,
either reject the qualification application or require the substitution of two additional servocomponents, if
one servocomponent of the qualification sample fails. The two servocomponents shall be submitted to all
applicable tests prior to and including the failed test(s). One of the two units shall then be selected to
undergo the remaining tests in place of the unit which originally failed. Failure of a second unit (from
either the original four or from the two reserve units) shall, in all cases, be cause for formal rejection of the
qualification sample.
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