MIL-DTL-81530B(OS)
3. REQUIREMENTS
3.1 General. The Mk 11 Mod 0 Ignition Element covered by this specification shall be manufactured in
accordance with DL 546659 and all documents listed thereon.
3.1.1 First article. When specified in the contract or purchase order (see 6.2), a sample shall be
subjected to the first article inspection (see 4.2.1 and 6.4). Unless otherwise specified by the procuring
activity, a first article sample of 146 ignition elements shall be manufactured using the same methods and
procedures proposed for the production lot. The sample shall be tested as specified in 4.3.2 and is the
purpose of determining that the contractor, prior to starting production, is capable of producing items
which comply with the technical requirements of the contract. When the ignition element is being
manufactured as an integral part of a procured cartridge, the first article and production lot testing of the
Mk 11 is not required.
3.2 Material. All materials used in the manufacture of the ignition elements shall conform strictly with
the specifications referred to on the respective Bureau of Naval Weapons drawings unless specific
approval in writing covering a departure therefrom has been obtained from the Naval Air Systems
Command prior to manufacture. When alternate materials or methods of manufacture are specified on the
drawings, the bidder's selections shall be clearly stated in the proposal.
3.3 Primary Components. For the purpose of this specification the loaded spacer charge, Drawing
2302165, is defined as a primary component. See 4.3.3.
3.4 Cleaning and condition of parts. All parts shall be free of chips, dirt, grease, rust and all other
foreign materials. There shall be no burrs nor other imperfections in manufacture which would harmfully
affect either the assembly or the functioning of the product. The cleaning methods which are used shall
not be injurious to any of the parts nor shall the parts be contaminated by the cleaning agents which are
used.
3.5 Explosive components, volatiles. The primer composition, Drawing 2519878, shall have a
maximum moisture content of 0.5% at time of loading as determined in 4.6.1. After consolidation of the
primer composition in the loaded spacer, Drawing 2302165, the loaded spacer shall be dried at +100bF to
+120bF for a minimum of 16 hours. After removal of the units from the drying equipment, if more than 4
hours elapse before their assembly into ignition elements, the units shall be dried at +100bF to +120bF
for a minimum of 4 hours immediately prior to their being assembled into ignition elements.
3.6 Insulation resistance. Prior to assembly of bridgewires, the insulation resistance shall not be less
than 50 megohms at a relative humidity of less than 80 percent when measured in accordance with 4.6.2.
3.7 Bridgewire (Soldering).
3.7.1 Bridgewire assembly, decontamination. All assemblies shall be cleaned and inspected as stated
in 4.6.3.
3.8 Igniter assembly, loading. The consistency of the ignition charge and the loading procedure shall
be regulated to secure an ignition charge which is free from internal voids while avoiding damage to the
bridgewire. The ignition charge shall fill the cavity such that the charge is flush with the top of the cavity
and the bridgewire is completely covered. All external surfaces of the igniter assembly shall be free from
any of the ignition charge. When necessary, external surfaces may be cleaned of ignition charge by
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