MIL-DTL-46618C (OS)
4.2.1 Inspections. Inspections shall be in accordance with MIL-A-2550 and ASTM E 1742/E 1742M.
4.3 Inspection conditions. Unless otherwise specified in the contract or purchase order (see 6.2),
inspection conditions shall be as follows:
a. Temperature: Room ambient 20 to 25 °C (68 to 77 °F)
b. Altitude: Sea level
c. Humidity: 50 percent relative, maximum
d. Atmospheric: 14.7 psia
4.4 First article inspection. At the beginning of regular production, the supplier shall submit a first article
sample to a Government approved facility for evaluation. The sample shall consist of 21 assembled
cartridges for ballistics testing including 12 for vibration tests, 5 assembled cartridges for sealant tests, 10
sets of unassembled components for dimensional and visual examination, and a quantity in accordance
with 4.4.2, i.e., cartridges assembled without the igniter and propellant charge for Ignition Device
sensitivity test. The first article sample shall be manufactured using the same materials, equipment,
processes, and procedures as used in regular production. All parts and materials, including packaging and
packing, shall be the same as used for regular production and shall be obtained from the same source of
supply. When it becomes necessary to make a change in either the Ignition Device, propellant, or igniter
lot after initial production, 12 assembled cartridges from the first production lot thereafter shall be tested
in accordance with 4.7.6. The Government reserves the right to require new first article samples until such
time as an acceptable sample is submitted (see 6.3).
4.4.1 Examination, tests, and facility. After provisional acceptance at source, the sample shall be
inspected for all requirements of the drawings and specifications at a Government laboratory or other
such facility specified in the contract (see 6.2).
4.4.2 Sample size for Ignition Device sensitivity. The number of cartridges assembled without igniter or
propellant to be submitted for Ignition Device sensitivity tests shall be in accordance with table II.
TABLE II. Ignition Device sensitivity.
Lot Size
Sample Size
3 to 15
3
16 to 25
4
26 to 40
5
41 to 65
7
66 to 110
10
111 to 180
15
181 to 300
25
301 to 500
30
501 to 800
35
801 to 1300
40
Over 1300
50
4.4.3 Temperature conditioning for ballistic test. The sample shall be temperature conditioned and tested
to determine compliance with 3.6.2.2. The sample for firing shall be conditioned to table III.
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