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|  MIL-F-51440A(EA)
The inspection requirements specified
4.2 Classification of inspecitons.
herein are classified as follows:
(a) Preproduction inspection (see 4.3).
(b) Quality conformance inspection (see 4.4).
4.3 Preproduction.
4.3.1 Sample. The preproduction of 50 filters shall be produced using the
same methods, materials, and equipment as will be used during regular produc-
tion.
4.3.2 Inspection procedure.
4.3.2.1 For examination and nondestructive tests. Preproduction sample of
filter shall be inspected for compliance with the drawings and all the charac-
teristics included in the classification of defects (see 4.4.3.4). The inhala-
tion resistance test (4.4.4.2) shall be performed prior to any pressure leakage
testing (4.4.4.1).
4.3.2.2 For destructive tests. Five back housings and five front housings
shall be taken randomly from the preproduction samples before assembly arid
tested as specified in 4.4.4.3. The acceptance number shall be zero.
4.3.3 Acceptance/rejection criteria. The preproduction sample shall meet
the inspection procedure specified in 4.3.2 to be acceptable. The contractor
shall obtain written approval from the contracting officer before proceeding
with regular production.
4.4 Quality conformance inspection.
4.4.1 Lotting. A regular production lot shall consist of the filter pro-
duced by one manufacturer at one plant from the same materials and under
essentially the same manufacturing conditions. Any change in equipment or pro-
cedure used in regular production from that used in the preproduction sample
shall be approved by the Government prior to its institution.
4.4.2 Sampling.
Sampling shall be con-
4.4.2.1 For examination and nondestructive tests.
ducted in accordance with MIL-STD-105.
4.4.2.2 For destructive tests. Five back housings and five front housings
shall be taken randomly from the lot before assembly and tested as specified in
4.4.4.3.
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