/+.&6.$
15
injury or material damage in the event an ignition element fires. The firing circuit shall contain a resistor
in series sufficient to regulate the current to 1.0 +0.10, !0.00 ampere measured to within an accuracy of
1 percent. This current shall be applied to the ignition element for a period of not less than 5 nor more
than 5.1 minutes. An ignition element which fires shall be considered defective and shall cause rejection
of the lot represented. If the ignition elements pass this test they shall then be subjected to the test of
4.7.8.2.
4.7.8.2 All-fire test. The ignition elements shall be conditioned at 70° ±5° F for a minimum of 6 hours
and then tested. During this test insure that the ignition element is sufficiently shielded to prevent
personnel injury or material damage. The firing circuit shall contain a resistor in series sufficient to
regulate the current to 4 +0.10, !0.00 amperes measured to within an accuracy of 1 percent. Any
ignition element which tails to fire within 0.025 second after current application shall be considered
defective and shall cause rejection of the lot represented. As a precaution against obtaining an apparent
defective element due to high internal circuit resistance, it is recommended that the resistance of each
element be measured prior to conducting the test.
4.7.9 Ballistic tests.
4.7.9.1 Number of ignition elements. The number of ignition elements selected from each production
lot for the ballistic tests shall be in accordance with the requirements of table A-2 of ANSI/ASQC Z1.9,
General Inspection Level II, but shall never be less than 15 (see 6.2 and 6.6). The ignition elements shall
be conditioned for a minimum of 6 hours at 70° ±5°F and fired in a closed chamber having an internal
volume, exclusive of ignition element volume, of ten cubic centimeters and adapted for measurement of
time from application of current to start of pressure rise and maximum pressure. The ratio of length to
diameter of the closed chamber shall be approximately 1:1. The firing current shall be 5 ±0.10 amperes.
In addition to the sample of ignition elements for the above test, ten additional ignition elements shall be
furnished from the production lot for investigative purposes.
4.7.9.2 Criteria of acceptability.
4.7.9.2.1 Chamber pressure. The chamber pressure shall meet the requirements of 3.11.2.1. Lot
acceptability shall be determined in accordance with the applicable provisions of ANSI/ASQC Z1.9 (see
6.2 and 6.6).
4.7.9.2.2 Response time. The failure of any ignition element to meet the response time requirements of
3.11.2.2 shall cause rejection of the lot represented.
4.7.9.2.3 Misfire. The failure of any ignition element to fire shall result in rejection of the lot
represented, unless such failure is plainly attributable to faulty test equipment or procedure.
4.8 Retest. There shall be no retests.
4.9 Test failure. If test failure is attributable to an assignable cause, excluding the test ignition element,
original test results should be discarded and that part of the test reconducted.
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business