MIL-F-18327F
4.5 First article inspection. First article inspection shall be performed at a laboratory acceptable to the Government
(see 6.3) on sample units which have been produced with equipment and procedures normally used in production.
4.5.1 Sample size. Eight filters shall be subjected to the first article inspection for complete testing. Two additional
sample units shall be required for group IV if the fungus test is performed.
4.5.2 Inspection routine. Sample units shall be subjected to the inspections specified in table VI, in the order
shown. All sample units shall be subjected to the inspections of group I. The samples shall then be divided as
specified in table VI for groups II, III, and IV.
TABLE VI. First article inspection.
Grades
Inspection
Requirement
Test
Number of
paragraph
paragraph
sample units
4, 6 5, 7
to be inspected
8
9
Group I
Visual and mechanical inspection
(external) 1/ - - - - - - - - - - - - - - - - - - - -
X
X
Terminal strength 2/ - - - - - - - - - - - - - - -
X
X
Solderability (when specified) - - - - - - - -
X
X
Resistance to soldering heat
10
(when specified)- - - - - - - - - - - - - - - - -
X
X
Seal - - - - - - - - - - - - - - - - - - - - - - - - - -
X
X
Dielectric withstanding voltage - - - - - - -
X
X
Insulation resistance - - - - - - - - - - - - - -
X
X
Electrical characteristics - - - - - - - - - - -
X
X
Stability at temperature extremes- - - - - -
X
X
Group II
Life (at elevated ambient temperature)- -
X
X
2
Group III
Temperature rise (when specified) 1/ 3/
X
X
Vibration- - - - - - - - - - - - - - - - - - - - - - -
X
X
Shock - - - - - - - - - - - - - - - - - - - - - - - -
X
X
6
Thermal shock - - - - - - - - - - - - - - - - - -
X
X
Immersion - - - - - - - - - - - - - - - - - - - - -
X
X
Moisture resistance 4/ - - - - - - - - - - - - -
X
X
See footnotes at end of table.
18
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