MIL --- PRF --- 51526B
(b) The filter shall also contain a barcode from which the following may be read: name,
contract number, lot number, national stock number, cage code, manufacturer's part num-
ber, serial number, manufacture date, expiration date, and measured airflow resistance and
filtration efficiency. Barcode dimensions and characteristics shall comply with MIL ---
STD --- 130.
3.5.4 Workmanship
3.5.4.1 The filters shall be free from foreign matter (dirt, oil, or viscous materials).
3.5.4.2 The filter units shall be free from cracked, bent, or dented metal sections, and
abraded gaskets.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classi-
fied as follows:
(a) First article inspection (see 4.2)
(b) Conformance inspection (see 4.3)
4.2 First article inspection.
4.2.1 Sample. The first article (FA) sample shall consist of 20 particulate filters unless
otherwise specified in the contract. The FA sample shall be produced using the same meth-
ods, materials, equipment, and processes as will be used during regular production.
4.2.2 Inspections to be performed. Unless otherwise specified by the terms of the con-
tract, the sample first article items shall be subjected to all of the verifications specified here-
in. Verification of requirements shall be by examination, (examination includes visual inspec-
tion with or without simple commercial measuring devices), demonstration, test data, or by
Certificate of Compliance (COC) with analysis or supporting evidence. The Government re-
serves the right to accept or reject each COC. First article filters shall be inspected according
to Figure 2, or as determined by the Government (see 6.2). Each filter shall be examined for
interface characteristics, identification markings, workmanship, and safety hazards. Each filt-
er shall then be tested for airflow resistance and filtration efficiency. Filters shall then be
packaged using the same methods, materials, equipment, and processes as will be used during
regular production. Packaged filters shall then be forwarded to the Government for rough
handling and additional tests. Requirements and verification methods are cross referenced
in Table I.
4.2.3 Acceptance criteria. If any first article sample item fails to comply with any of the
applicable requirements, the first article sample shall be rejected.
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