MIL-S-8959(ASG)
4.3.1.3 Adverse tolerance units.- To facilitate fabrication of adverse toler-
`)
ance units, it will be permissible for one of the mating parts required to make Up
th-e critical clearance be outside of drawing tolerance, provided that the clearance,
..
as established, meets the requirements.
4.3.2 Inspections.- The preproduction inspections shall consist of all the
examinations and tests specified herein and in the applicable detail specification.
4.4 Quality conformance inspections.- Quality conformance inspections shall
consist of the examination and tests specified in sampling plans A and B.
4.4.1 Sampling plan A.- Sampling plan A shall consist of:
(a) Material inspection (4.5.1)
(b) End item inspection (4.5.2)
4.4.2 Samplingplan B.- Samples shall be selected at random from assemblies
that have passed the sampling plan A inspections and shall be subjected to the test
specified in 4.5,3. The selection of samples shall be made as follows:
(a) One from the first 10 production items.
(b) One from the 70th to 80th production items.
(c) One from each 100 thereafter until the 500th item.
4.4.3 Rejection and retest.- When one item selected from a production run fails
to meet the specification, no item on hand or later produced shall be accepted until
the extent and cause of failure are determined and corrective action taken on all
affected parts. Rejected assemblies shall not be resubmitted for inspection without
furnishing the procuring activity the reason for rejections and full particulars con-
cerning measures taken to correct the defects.
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4.5 "Inspection methods.-
4.5.1 Material inspection.- When specified (see 6.2), the material used in the
manufacture of the hydraulic springs shall be inspected to determine conformance to
the applicable material specification.
4.5.2 End item inspection.- Each hydraulic spring assembly shall be inspected
to determine conformance to the applicable detail specification or drawings. There
shall be no evidence of' leakage when serviced with the proper fluid and pressurized
to the normal unloaded pressure for not less than 24 hours.
4.5.3 Cyling.- The samples selected as specified in 4.4.2 shall be filled
with the proper fluid and pressurized to the normal unloaded pressure. The assembly
shall then be placed in a machine capable of stroking it through full design travel.
The machine shall stroke the assembly at the frequency rate specified by the procuring
activity. A full cycle is defined as one loading stroke and one unloading stroke,
each stroke being at least 90 percent of the full stroke of the spring. After 20
complete cycles, the spring shall. conform to the design
requirements of the average
load-stroke curve for the applicable class (see 3.4.3).
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