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)

considered a defective and a retest of another marker shall be made.

Defective are markers failing to meet the requirements of 3.3.1.4.

4.3.2.1 Jolt test. The marker shall be subjected to the jolt test

prescribed in Standard MIL-STD-350. The marker shall be assembled to the

test equipment using Test Fixture, SA Drawing 2522980, for mounting.

Defectives are markers failing to meet the requirements of 3.3.2.1.

4.3.2.2 Forty (40) foot drop test. The marker shall be subjected to

the forty foot drop test prescribed in Standard MIL-STD-352, except the

markers shall be dropped free-fall without guidance system or associate

equipment. Defective are markers failing to meet the requirements of

3.3.2.2.

4.3.2.3 Vibration test. The marker, in the armed position, shall be

subjected to a vibration test using the equipment specified in Standard

MIL-STD-353. The marker shall be assembled to the test equipment using

Test Fixture SA Drawing 2522934, for mounting. The marker shall be tested

at a single vertical amplitude of 0.030 0.002 inches throughout a frequency

range of 1100 to 3000 cycles per minute in increments of 100 cycles per

minute. The running time for each increment shall be 10 minutes. This

schedule shall be repeated with the marker in each of the following three

positions: (1) base end down, (2) base end up and (3) longitudinal axis

horizontal. Each marker shall receive a total of 10 hours vibration.

Defective are markers failing to meet the requirements of 3.3.2.3.

CAUTION:

The marker shall be returned to the "SAFE"

position when vibration test is completed.

4.3.2.4 Temperature and humidity test. The marker shall be subjected

to one 14 day temperature and humidity cycle prescribed in Standard MIL-STD-

354. Defectives are markers failing to meet the requirement of 3.3.2.4.

4.3.2.5 Grouped data acceptance. Data shall be grouped for static

functioning on the sample of 36 markers composed of the following groups:

Group (a)

Eight (8) markers from the

vibration test of 4.3.2.3,

Group (b)

Eight (8) markers from the

temperature and humidity

test of 4.3.2.4,

Group (c)

Twenty (20) markers from the

sealing test of 4.3.1.1.

Acceptance shall be as specified in Table I.