MIL-A-21180D
Once this condition is satisfied, samples may be sized in accordance with Inspection Level S-2 of
MIL-STD-105, with an Acceptance Number Zero, and a Rejection Number 1.
4.4.2.4.4 Locations of specimens for tension tests, large castings. The locations in the
casting from which coupons for the tension test are to be taken shall be identified on the casting
drawing. Test specimen blanks shall be excised after final heat treatment from the casting where
feasible. Excision may be performed by deep trepanning or sawing, as applicable. If specimen
blanks cannot be excised from the casting, they may be removed from gates adjacent to the
locations of concern of the casting. When, at a given location of concern, specimen blanks cannot
be excised from the casting, and there are no gates adjacent to that location, provision shall be
made for integrally cast test bars to be attached to that location. Such bars shall not be removed
until all heat treatments have been completed, unless the bars interfere with inspection processes
or straightening whereupon they may be removed after solution treatment but must accompany
the associated casting during precipitation heat treatment. From those castings which have
specimen blanks cut from gates or have integrally cast test bars, one casting per each 25 casting
lots shall be sectioned for test specimens in the locations where the test bars are attached.
Specimens made from these specimen blanks shall be tension-tested together with the specimens
made from test bars to ensure that approved foundry control is being maintained.
4.4.2.4.4.1 Sampling, large castings, separately cast test specimens. Alternatively, with the
agreement of the purchaser, casting lot sizes of one to 8 castings may be sampled on the basis of
heat treat batch. At least one casting shall be selected at random from each group of castings heat
treated together in batch type furnaces. In addition, two or more separately cast tension test
specimens shall be cast from each heat with the castings and heat treated with the castings of the
same heat. All specimens shall be tension tested. Separately cast specimens shall meet Class 2
requirements.
4.4.2.5 Samples of A201.0-T7 for electrical conductivity test. Electrical conductivity tests
(see 4.5.5) shall be performed on tension test specimens, blanks or parts of A201.0-T7, in order
to determine compliance with the requirements of 3.4.4.
4.4.2.6 Sampling for surface roughness. When surface roughness has been specified for a
casting or portion thereof (see 6.2.1), following process control approval, a random sample of
castings shall be selected from each casting lot and inspected in accordance with 4.5.7. Samples
from the first ten lots produced shall be sized in accordance with Inspection Level S-2 of
MIL-STD-105, Acceptance Number Zero, Rejection Number 1. Such sizing shall be maintained
until ten lots, produced consecutively, have demonstrated acceptability. Following such
demonstration, samples shall be sized in accordance with Inspection Level S-1 of MIL-STD-105,
Acceptance Number Zero, Rejection Number 1.
4.4.3 Noncompliance and retest. Failure of any sample or samples to conform to any one of
the requirements of this specification shall make the lot represented by that sample or samples
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