MIL-DTL-0048669A (AR)
4.5 Methods of inspection.
4.5.1 Inspection Equipment. The inspection equipment required to perform the
examination and tests prescribed herein is described in the Inspection Method Column in the
tables starting with paragraph 4.4.2.1. Inspection equipment used for acceptance of product
shall be capable of repeatable measurements, by various experienced inspection/test personnel,
to an accuracy of 10% or better of the total tolerance of the characteristic being inspected. Any
automated acceptance inspection equipment (AAIE) prove-out shall be performed in accordance
with MIL-A-70625 (see 6.6).
4.5.2 Push test of simulated setback pin into spring setback. The setback spring shall be
placed in an approved fixture and the force necessary to push the simulated setback pin through
the tangs shall be measured. If the measured force for any spring in the sample is less than the
minimum allowed by the applicable drawing the spring lot shall be rejected and be set aside for
disposition in accordance with MIL-STD-1916. If the measured force for any two or more
springs is more than the maximum allowed by the applicable drawing the spring lot shall be
rejected and be set aside for disposition in accordance with MIL-STD-1916. This test is a
destructive test. Parts so tested shall not be returned to the lot.
4.5.3 Verification of heat treat of spring setback. The setback spring shall be subjected
to the Knoop hardness reading in accordance with ASTM D1474. After completion of the push
test of simulated setback pin, the three (3) setback springs exhibiting the lowest push test force
shall be subjected to this test. If any setback spring fails to comply with the requirement
specified on the applicable drawing, the heat treatment batch represented by the sample shall be
rejected and be set aside for disposition in accordance with MIL-STD-1916. This test is a
destructive test. Parts so tested shall not be returned to the lot.
4.5.4 Push off test of rotor assembly. The rotor assembly shall be placed in an approved
fixture and the force specified on the applicable drawing shall be applied to the detonator, as a
minimum. The push off force shall not exceed 10% of the specified minimum value. The push
off force shall be applied uniformly over the surface of the detonator. This test shall be
conducted prior to tests specified in 4.5.11, 4.5.12, and 4.5.13 when done as part of the
escapement assembly. This test is considered a non-destructive test within the specified limits.
Parts so tested may be returned to the lot.
4.5.5 Check test for deterioration of detonators. If the total time between original
acceptance of any lot and the assembly of that lot into the escapement assembly exceeds two
years, or if the detonators have been subjected to adverse conditions, however brief, at any time
since the previous tests, the detonator lot shall be subjected to and must satisfactorily pass, the
check test for deterioration specified in MIL-D-14978 immediately before the detonator lot is
assembled into the escapement assembly. This test shall be performed by the contractor on
detonators selected by the Government inspector at the facility assembling the detonators into
the escapement assembly.
4.5.6 Torque test of verge assembly. The verge assembly shall be placed in an approved
fixture and the torque specified on the applicable drawing shall be applied, as a minimum. The
torque applied to the verge assembly shall not exceed 20% of the specified minimum value.
The bearing surfaces of the verge assembly shall not be utilized for retention of the assembly
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