MIL-A-21180D
which are heat-treated in one furnace load and manufactured by the same production technique.
The unit of inspection shall be one casting.
4.4.2 Sampling instructions. Unless otherwise specified herein or on the drawing or other
purchase information and where applicable, sampling plans and procedures in the determination of
the acceptability of products shall be in accordance with the provisions set forth in MIL-STD-105
or MIL-STD-2175 where specified (see 6.2.1).
4.4.2.1 Sampling for visual and dimensional examination. All castings shall be subjected to
the visual and dimensional inspection specified in 4.5.6.
4.4.2.2 Sampling for chemical composition. Samples to determine conformance to 3.3.1
shall be taken from the heat. Samples from castings need not be taken unless compliance with
3.3.1 is questionable. All samples shall be subjected to the test of 4.5.1.
4.4.2.2.1 Samples from heats. A minimum of two samples shall be taken from each heat,
one at the beginning of the pour into casting molds, the second at the termination of the pour.
Additional samples may be taken during the course of the pour, if such are needed to determine
that compliance with 3.3.1 is being maintained.
4.4.2.2.2 Samples from castings. When compliance with 3.3.1 has not been established for a
particular melting lot of castings, a random sample from that casting lot shall be selected in
accordance with MIL-STD-105, Inspection Level S-1, Acceptance Number Zero, Rejection
Number 1, for the test of 4.5.1.
4.4.2.3 Sampling for penetrant and radiographic inspection.
4.4.2.3.1 Penetrant inspection. All castings in each lot shall be penetrant inspected in
accordance with 4.5.3.
4.4.2.3.2 Radiographic inspection. Sample castings shall be inspected in accordance with
4.5.2. The number of castings to be radiographed shall be determined as follows. Following
process control approval, from the first 10 production lots of a particular cast part, the number of
castings selected from each lot for radiographic inspection shall, as identified by MIL-STD-2175
inspection class, be:
Classes 1 and 2 castings - Each casting in the lot shall be completely examined.
Class 3 castings - Sample size shall be selected in accordance with the table for Class 2
castings of MIL-STD-2175, and be completely examined.
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