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Dimensional control of cast parts. |
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4.4.3 Testing.
Testing is described in the First Article and
Quality Conformance Inspection tables.
4.4.4 Inspection equipment.
The inspection equipment required
to perform the examinations and tests prescribed herein is described
in the Paragraph Reference/Inspection Method column in the tables
starting with Paragraph 4.4.2.1. The contractor shall submit for
approval inspection equipment designs in accordance with the terms
of the contract. See Section 6 of MIL-A-48078 and 6.3 herein.
4.5 Test methods and procedures.
4.5.1 Dimensional control of cast parts.
In place of the
normal sampling associated with the Classification of Defects, and
with the approval of the Contracting Officer, a sample of at least
from each cavity shall be dimensionally
five (5) parts (as cast)
inspected to qualify a new or reworked cavity for use in production
or as a control of the cavity during production. Inspection for
control of each cavity during production shall be performed on the
above quantities from each cavity after production of 500 parts.
Individual cavity identification shall be provided.
If any defective parts are found during qualification of the
cavity, the cavity producing the defective part will not be used in
production. If any defective parts are found when inspection is
performed for control of the cavity, the cavity producing the
defective part shall be removed from production. Further, that
portion of production since the last control check shall be returned
to the contractor for corrective action.
All cavities formerly removed from production because of some
fault, may, after reworking, be returned to production providing
they pass the qualification test as above. The contractor may
request a change of inspection frequency providing he presents
objective evidence to substantiate the request to the Contracting
Officer.
Five (5) of each specified part shall
4.5.2 Salt spray test.
be selected from each lot and subjected to the salt spray test in
accordance with the procedures specified in ASTM B 117. The minimum
exposure time shall be one and one half (1
hours using a 5%
sodium chloride solution. If any part shows evidence of corrosion,
it shall be classed defective and the lot shall be rejected.
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