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MIL-M-81392 Marker, Location, Marine Mk 25 And Mods 2 And 3This specification covers the manufacture, assembly, preparation for delivery of the Marker, Location, Marine MK 25 and Mods 2 and 3, and the methods of examination and tests upon which product acceptance shall be based. The marker consists of an aluminum body containing a pyrotechnic composition which produces a yellow flame and white smoke when electrically initiated by Mk 13 Mod O Electric Squib which is activated by a Mk 72 Mod 1 Water Activated Battery. The base of the marker contains a safe-arm feature that seals the battery cavity. The marker is classified as Class B Explosives \( Code of Federal Regulations 49 CFR 71-78\) and IIC Explosives \(Coast Ward Rules and Regulations for Military Explosives and Hazardous Munitions CG 1.08\).

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MIL-M-81392(AS)
3.2 Examinations.
3.2.1 Components, assemblies and materials. All components, assemblies
and materials of the marker shall meet all the requirements of their
respective specifications or drawings.
3.2.1.1 Squib, The squib shall meet the requirements of the applicable
specification.
3.2.1.2 Battery. The battery shall meet the requirements of the
applicable specification.
3.2.1.3 Starter composition. The starter composition shall meet the
requirements of the applicable specification.
The marker shall meet the requirements of this specification ,
3.2.2 Marker.
3.3 Performance and product characteristics.
3.3.1
Performance.
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3.3.1.1 Sealing. The marker shall withstand a vacuum of 6.0  1.0 inches
of mercury (11.7 psia) for a minimum period of 30 seconds without leakage.
3.3.1.2 Vent release force. When in the armed position the base plugs
(two), shall each withstand an axial force of 1.0 pound without pushing into
the base cavity.
3.3.1.3 Static functioning. The marker shall meet the following
requirements.
a.
b.
the water.
c.  Produce yellow flame and white smoke for 13.5 minutes minimum
to 18.5 minutes maximum,
3.3.1.4 Flight functioning, The marker shall meet the following
requirements.
a. Function (produce flame and smoke).
b. Produce a visible marker within 15 seconds after striking
the water.
c. Produce yellow flame and white smoke for 13.5 minutes minimum
to 18.5 minutes maximum.
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