MIL-DTL-23659F
APPENDIX A
A.6. TEST PROCEDURES
A.6.1. Pre-Test Documentation. The manufacturer shall examine each ILI per
manufacturing instructions prior to beginning the test sequence. Certification that all
inspection requirements have been met shall be supplied as part of the test documentation.
A.6.1.1. Visual Inspection. Each ILI shall be visually inspected in accordance with the
manufacturer's acceptance criteria. Visual inspection following the environmental testing shall
detail any damage found. Failure to meet the manufacturer's incoming inspection criteria shall
not necessarily be cause for failure or rejection of the ILI following environmental testing.
A.6.1.2. Radiographic Examination. Each ILI shall be subjected to radiographic examination
such as X-ray, neutron bombardment, gamma rays, etc. and the radiographic plates shall be
examined for defects in accordance with the manufacturer's acceptance criteria.
A.6.1.3. Bridge Circuit Resistance. Each ILI bridge current resistance shall be measured
with accuracy within 2 percent maximum using a test that subjects the bridge to a current of less
than 100 milliamperes. These tests shall be conducted in accordance with MIL-STD-202,
method 303, the measurement shall be corrected to 25 C.
A.6.2. Firing Properties. To determine the firing properties, the ILI shall be energized from
the firing unit of paragraph A.5.1. The firing capacitor voltage shall be varied according to the
requirements of the statistical test used. In each case, control the voltage to better than 1 percent
of the required value. The actual voltage applied shall be accurately measured for input into the
statistical test used. ILI used for this test shall be temperature conditioned at the test temperature
for a minimum time of 12 hours. Alternatively, the ILI can be conditioned until the temperature
of the tested units stabilizes as determined by thermocouples deeply buried in the assembly or in
surrogate inert assemblies conditioned along side of the test units. The conditioning duration and
logic used for selecting less than 12 hours shall be documented and assemblies photographically
recorded. The ILI shall be temperature conditioned to hot and cold; conditioning to ambient is
required only when the device storage temperature and/or air temperature is not within the
acceptable range. Effort shall be made to assure that the ILI meets the temperature requirements
at the moment it is functioned. Cold temperature shall be a maximum of -54 C (-65°F), ambient
temperature shall be +23 ± 10 C (+73 ± 18°F), and hot temperature shall be a minimum of +71 C
(+160°F). Each ILI shall be configured such that there is an unambiguous determination of the
acceptability of the ILI's output when fired. ILI with detonating output, such as an EFI, will
typically use a dent block to determine the acceptability of the output; while deflagrating ILI,
such as a DILI, may fire into a pressure bomb or use some other technique to determine the
acceptability of the output. The methodology used for output determination shall be documented
in the test plan and subject to review of the applicable safety authority prior to the start of testing.
A.6.3. Maximum No-Damage Current, (MNDC). The ILI input leads shall be subjected to
DC current levels in accordance with an accepted statistical method similar to that used for the
firing properties test (Bruceton, Langlie, Neyer, etc.). The ILI shall be subject to DC current in a
bare condition and conducted at an ambient temperature of +23 ± 10 C. The applied current
shall not overshoot the intended test current level by more than 5 percent. The full test current
shall be applied for a minimum of 1 minute. The period of time that the current is rising to the
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