MIL-DTL-23661B(OS)
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in
accordance with 4.3.
3.2 Conformance to documents. The Mark 45 Mod 0 Impulse Cartridge covered by this specification shall
be manufactured in accordance with DL537926.
3.3 Materials. All materials used in the manufacture of the cartridges shall conform strictly to the
specifications referred to on the respective drawings. When alternate materials or methods of manufacture are
specified on the drawings, the bidder's selections shall be clearly stated in the proposal.
3.4 Primary components. For the purpose of this specification, the primer mix (Drawing 2406487) is
considered a primary component.
3.5 Insulation resistance. Prior to installation of the bridgewire, the insulation resistance between pins and
case shall not be less than 2 megohms at a relative humidity of less than 80 percent when measured with a
500-volt megohmmeter (see 4.5.1).
3.6 Bridgewire. The bridgewire shall be welded to the pins.
3.7 Bridgewire continuity. Before filling the cavity around the bridges with the igniter compound, the bridge
assemblies shall be thoroughly cleaned and inspected for proper attachment and absence of projecting ends.
After cleaning, the bridgewire shall be flashed by application of an electric current to assure continuity of
both bridgewires. The current shall be regulated to produce a visible red glow of the bridges. An
electromagnetic force (EMF) of approximately 1.5 volts ac or dc may be used with a suitable series resistor to
adapt the source characteristics to the primer resistance. Flashing is a necessary manufacturing operation and
shall be conducted on each bridgewire assembly. Assemblies which fail to glow in both bridges shall be
screened from acceptable material in the process. The discarded assemblies may be reworked by replacement
of the bridges.
3.8 Primer mix. The primer mix shall be compounded as specified on Drawing 2406487.
3.9 Loading of igniter composition. The techniques of loading the igniter composition shall be such as to
avoid damage to the bridgewire. The composition shall be smoothed off flush with the top of the cavity. All
igniter composition shall be removed from exterior lateral areas of the spacer. Allow to dry thoroughly before
cementing mylar disc in place. The dried composition shall be free from cracks, voids, and separation from
the ignition cup. The charge shall entirely cover the bridgewire.
3.10 Propellant charge.
3.10.1 Quantity. All propellant charges shall be determined by weight rather than by volume measurement.
3.10.2 Smokeless powder: handling, and loading. The smokeless powder shall be subjected to no
unnecessary handling or exposure to the atmosphere. The handling and loading of smokeless powder exposed
to the atmosphere shall be performed only under conditions that do not permit the relative humidity to exceed
75 percent.
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