MIL-PRF-28750F
d.
Appropriate preventive action has been initiated.
e.
The failure shall not have the potential to cause any latent field failure on the remaining SSR's.
f.
The preceding conditions shall not apply in those cases (instances) where the failures can be directly
attributed to random equipment failure or operator error, with qualifying activity concurrence.
4.6.1.2.2 Sampling plan (group A4). Two samples shall be selected randomly from each inspection lot and
subjected to the group A4 solderability test. The manufacturer may use electrical rejects from the group A2 screening
tests for all or part of the samples to be used for solderability testing. If there is one or more defects, the lot shall
have failed.
4.6.1.2.2.1 Rejected lots (group A4). In the event of one or more defects, the inspection lot is rejected. The
manufacturer may use one of the following options to rework the lot:
a.
Each production lot that was used to form the failed inspection lot shall be individually submitted to the
solderability test as required in 4.6.1.2.2. Production lots that pass the solderability test are available for
shipment. Production lots failing the solderability test can be reworked only if submitted to the solder dip
procedure in (b).
b.
The manufacturer submits the failed lot to a 100 percent solder dip using an approved solder dip process in
accordance with 3.6.11.3. Following the solder dip process, the A2, A3, and A4 group A inspections shall
be repeated on the lot. If the lot fails the group A2 PDA requirement or fails the group A4 solderability test,
the lot shall be rejected and shall not be furnished against the requirements of this specification.
4.6.1.2.3 Disposition of samples. The solderability test is considered a destructive test and samples submitted to
the solderability test shall not be supplied on the contract.
4.6.2 Periodic inspections. Periodic inspections shall consist of group B and group C. Except where the results of
these inspections show noncompliance with the applicable requirements (see 4.6.2.2.4), delivery of products which
have passed group A shall not be delayed pending the results of these periodic inspections.
4.6.2.1 Group B inspection. Group B inspection shall consist of the tests specified in table III and shall be made on
sample units which have been subjected to and have passed the group A inspection.
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