MIL-DTL-24317B
4.5.1 Sample. Unless otherwise specified (see 3.1), the number of sample units comprising a sample
of switches to be submitted for qualification inspection shall be in accordance with table V. The sample
shall be produced with equipment and procedures normally used in production. The sample shall consist
of switches, of one basic style (complete with barriers, panel seals, and color filters, if applicable), and at
least one lens of each style, color, and transmittance (see 3.1).
4.5.2 Inspection routine. Sample units of switches shall be subjected to the qualification inspection
specified in table III, in the order shown. All sample units shall be subjected to the inspection of group I.
The sample units shall then be divided as specified in table III and subjected to the inspection for their
particular group. All applicants for qualification approval under this specification shall demonstrate that
each of their items conforms to all the requirements specified in the applicable documents (see 3.1),
singularly and in combination with all other previously qualified items, regardless of manufacturer.
4.5.3 Failures. One or more failures shall be cause for refusal to grant qualification approval. Lamp
failure shall not be considered a unit failure; when the lamp failure is noted, immediately a new lamp is
installed and the lamp functions test shall then be continued, as required. A lamp or LED failure for a
nonreplaceable item shall be considered a unit failure (see 3.1).
4.5.4 Extent of qualification.
4.5.4.1 Single submission. Qualification shall be restricted to the style submitted.
4.5.4.2 Group submission. The extent of qualification shall be in accordance with the applicable
specification sheet (see 3.1).
4.5.5 Retention of qualification. To retain qualification, the supplier shall forward at 24-month intervals,
or when 50,000 units of one style have been produced whichever is more frequent to the qualifying
activity, a summary of the results of groups A and B tests, indicating as a minimum the number of lots
which passed and the number which failed, and the complete results of group C tests. If test results
indicate nonconformance with specification requirements, action shall be taken to remove the failing
product from the qualified products list. Failure to submit the test results shall result in loss of qualification
for that product. In addition to the periodic submission of inspection data, the supplier shall immediately
notify the qualifying activity when inspection data indicates failure of the qualified product to meet the
requirements of this specification.
4.6 Preproduction inspection. Preproduction inspection shall be performed by the supplier, after award
of contract and prior to production, at a laboratory satisfactory to the Government (see 6.2.2). Unless
4.7 Conformance inspection.
4.7.1 Inspection of product for delivery. Inspection of product for delivery shall consist of groups A, B,
and most recent C.
4.7.1.1 Inspection lot. An inspection lot, as far as practicable, shall consist of all switches, barriers,
color filters, lenses, and panel seals covered by the same military specification sheet produced under
essentially the same conditions, and offered for inspection at one time.
4.7.1.2 Group A inspection. Group A inspection shall consist of the examinations and tests specified in
table VI, and shall be made on the same set of sample units in the order shown.
randomly selected group(s) of samples is required. For acceptance of the lot there shall be zero
occurrences of defects.
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