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Igniter Charge Weightiest (see 4.3.3.6) |
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MIL-I-60476A(MI)
*
4.4.5 Igniter Functioning Test (see 4.3.3.5. Those igniters
previously selected and accepted shall be temperature conditioned as
follows:
CONDITIONING TEMPERATURE
+115F (46.1C)
-65F (-53.9c)
+165F (73.9C)
1-10
31-40
Igniter
61-70
11-20
41-50
Serial
71-80
21-30*
51-60*
81-90*
Number
* In the event of 29 units at any temperature, Table B5 of MIL-STD-414
shall be read using sample size 30. Each igniter selected shall be
conditioned to assume a uniform temperature throughout its entire mass at
the time of firing. Minimum conditioning time shall be eight hours.
Maximum conditioning time shall be twenty-four hours. During the last
three hours of conditioning, the cabinet temperature shall be maintained
within three degrees of the specified temperature. Any igniter not fired
within five minutes shall be returned to the applicable conditioning
cabinet for not less than one hour. Any igniter left out of the cabinet
over five minutes before firing shall be placed at ambient temperature
for not less than (12) twelve hours before reconditioning to the
specified temperature. A direct current (DC) power supply shall provide
a firing pulse of 1.5 0.15 amperes to the igniter circuit. The temperature
and the functioning time shall be recorded for each igniter. Firing of the
entire sample shall be completed regardless of when the rejection number
occurs. Functioning time is that overall elapsed time between closing of
the electrical firing circuit and the time when the igniter coined surface
ruptures. The methods and apparatus used for this test shall be approved
by the procuring activity.
4.4.6 Igniter Charge Weightiest (see 4.3.3.6). Igniter charge
blend weight shall be determined by an average of duplicate weighings
of the test samples, utilizing a calibrated analytical balance. Weighings
should agree within 0.1 grams of each other.
*
4.4.7 Igniter Charge Composition Test (see 4.3.3.7).
*
4.4.7.1 Charge Composition by Potassium Nitrate.
*
4.4.7.1.1 Percent Potassium Nitrate in Black Powder. A precisely
known sample weight of black powder from thee lot of black powder used
in the Igniters being tested) for approximately ten (10) grams shall be
analyzed according to MIL-P-223 procedure 4.4.4.1.1. The percent
potassium nitrate In the black powder shall be calculated.
12
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