MIL-DTL-52031E
(a) First article inspection (see 4.2)
(b) Conformance inspection (see 4.3)
4.2 First article inspection. First article inspection shall be performed on three preproduction
extinguishers to prove prior to starting production that the extinguishers comply with the requirements of
this specification. The extinguishers shall be produced in accordance with the contractor s normal
production processes and tooling. This inspection shall include examination in accordance with 4.4.1 on
each of the 3 samples and the testing sequence as shown in table II. Unless otherwise specified (see
6.2), the government will conduct all of first article examination and testing.
TABLE II. First article testing requirements and sequence
Sample
Testing requirements and sequence
Number
4.4.2.7
4.4.2.9
4.4.2.10
4.4..2.11
1
Corrosion
Bracket
Puncture
Safety Pin
Loading
4.4.2.3
4.4.2.9
4.4.2.10
4.4..2.11
4.4.2.1
4.4.2.2
4.4.2.4
4.4.2.5
2
Vibration
Bracket
Puncture
Safety Pin
Seal Torque
Leaks
Seal Disk
Drop &
Loading
Burst Pres.
Discharge
4.4.2.3
4.4.2.6
4.4.2.8.1
4.4.2.8.2
4.4.2.8.3
4.4.2.8.4
4.4.2.8.5
3
Vibration
Performance
Acc. Aging
Impact
Thermal
Acc. Aging
Dielectric
for materials
Shock
Shock
4.2.4 Inspection failure. Failure of the first article extinguishers to meet any requirements specified herein
during and as a result of the examinations and tests specified in 4.2 shall be cause for rejection.
4.3 Conformance inspection. Conformance inspection shall consist of examination and testing specified
under 4.4.1, 4.4.2.1, 4.4.2.2, and 4.4.2.11.
4.3.1 Sampling. Sampling shall be in accordance with ANSI/ASQ Z1.4, Inspection Level II.
4.3.1.1 Examination. Samples shall be examined for the major and minor characteristics for possible
defects as specified in 4.4.1. AQL shall be 2.5% for major defects, and 4.0% for minor defects.
4.3.1.2 Tests. Samples shall be tested as specified in 4.4.2.1, 4.4.2.2, and 4.4.2.11. AQL shall be 2.5%.
4.4 Inspection procedure.
4.4.1 Examination. The sample extinguishers shall be examined for the following characteristics for
possible defects:
Major
Requirements Paragraph
101.
Design and construction not as specified.
3.1
102.
Material not as specified.
3.3
103.
Cylinder shell not as specified.
3.4
104.
Siphon tube not as specified.
3.4.1
105.
Cylinder-seal assembly not as specified.
3.5
106.
Seal disk not as specified.
3.5.1
107.
Cylinder-seal washer not as specified.
3.5.2
108.
Cylinder-head assembly not as specified.
3.6
109.
Cylinder-head gasket not as specified.
3.6.1
110.
Threaded swivel not as specified.
3.6.2
111.
Valve not as specified.
3.6.3
8
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