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Methods of inspection
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Signals, Illumination, Aircraft Double-star An-M27A2 Through AN-M42A2
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Air leakage test



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MIL-S-1398E(AR)
Determine the moisture content of the star charge composition in
accordance with Method 101.2 given in MIL-STD-1234 using a suitable
size sample (50g).
4.5.1.1.2 Alternate method.  The moisture content shall be
determined in accordance with Method T 101.4 of MIL-STD-286.
4.5.1.2 Black powder.  The method of determining percentage of
moisture in black powder shall be in accordance with specification
MIL-STD-1234, Method 102.1.1 using 2 g. sample and 70 to 75C
heated for 4 hrs.
4.5.1.3 Polypropy lene felt, paper and chipboard.  Ten g of each
material shall be accurately weighed, placed in a tared weighing
dish.  The dish and contents shall be weighed and placed in an oven
and dried at 100 + 2C (212 + 5F) for 2 hours.  The dish shall
be cooled in a desiccator and weighed. The loss in weight shall be
calculated as percent moisture in the sample.
4.5.2 Transportation vibration.  The signal assemblies shall be
packaged and packed in accordance with dwg. 8836949 and 8836950.
Each packed box shall be subjected to the transportation vibration
test specified in MIL-STD-331, except that each box shall be
vibrated at the specified amplitudes for four (4) hours in each of
three different positions (i.e. box positioned so that signal
assemblies are vertical with base end down, box positioned so that
signal assemblies are horizontal, and box positioned so that the
signal assemblies are vertical with base end up).  After the test,
the packing box and the signal assemblies shall be examined to
(Non-Destructive Test)
determine compliance with the requirements.
4.5.3 Functioning.  The signal shall be immersed to a depth
between 6 and 9 inches for 2 hours, in water maintained at 21
2C (70 + 10F).  At the end of the immersion time, the signals
shall be--removed from the water and the exterior surfaces wiped
dry.  The signals shall be fired in a pistol for which the signal is
standard, that is mounted on a tower platform at a min. height of
100 feet above the ground.  The signals shall be observed for
compliance with the requirements (See 6.5).  Any signal which fails
to comply shall be classed defective.
4.5.3.1 Test Validity.  If for any reason the test conditions
have detrimentally affected the test results, the test shall be
declared invalid and a new test shall be performed with additional
samples.
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