MIL-DTL-62545E
4.6.7.8.2 Control. Conformance to 3.4.8 shall be determined by inspection of contractor records providing
certification that the MSEC's have been fabricated in accordance with the design verified and approved during
qualification.
4.6.8 Environmental. The MSEC shall be operated in the extinguisher monitoring mode except as otherwise
specified herein. The MSEC shall pass the tests specified in 4.6.7.1 through 4.6.7.6 during or after environmental
tests as specified. There shall be no false alarms.
4.6.8.1 Temperature. To determine conformance to 3.5.1, the MSEC shall be tested as specified in 4.6.8 during
4.6.8.1.1 High temperature. To determine conformance to 3.5.1.1, the MSEC shall be placed in an oven and the
temperature maintained at 71°C (160°F). A 22 to 28 V dc battery, external to the oven, shall be connected to the
MSEC and be capable of producing (through the MSEC) two extinguisher drive signals simultaneously at no less than
20 A total. The MSEC shall be allowed to thermally stabilize for 24 hours and then maintained at high temperature
for a period of 200 ± 24 hours. There shall be no false alarms. A recorder, with at least four channels, shall measure
and record voltage across each extinguisher activation pin continuously during the test for indications of any false
alarms. The samples shall be inspected at least two times per day, a minimum of 4 hours apart, and the inspection
shall be noted on the recorder's trace. During these inspections, the MSEC shall be checked by energizing
appropriate connector points to activate the extinguisher drive circuitry and BITE, and these operations noted on the
trace.
4.6.8.1.2 Low temperature. To determine conformance to 3.5.1.2, the MSEC shall be placed in a low temperature
test chamber. The instrumentation requirements shall be as specified in 4.6.8.1.1. The test conditions of 4.6.8.1.1
shall apply, except the chamber temperature shall be maintained at -51°C (-60°F).
4.6.8.1.3 Temperature shock. To determine conformance to 3.5.1.3, the MSEC shall be put through three high
temperature to low temperature cycles as described below. The instrumentation requirements shall be as in 4.6.8.1.1
and 4.6.8.1.2 as to type(s) and location(s). The MSEC shall be set up and checked by energizing appropriate
connector points to activate the extinguisher drive circuitry and BITE. The MSEC shall be exposed to ambient
temperature for no more than 5 minutes during transfer. The procedures of 4.6.8.1.1 and 4.6.8.1.2 apply except:
The MSEC shall be placed in an oven preheated to +71°C (+160°F) and maintained for 24 ± 2 hours.
Step 1.
While at this high temperature, the MSEC shall be checked as described in 4.6.8.1.1.
Step 2.
Immediately following step 1, the MSEC shall be transferred to a precooled low temperature chamber
and maintained at -51°C (-60°F) for a period of 24 ± 2 hours. While at this low temperature, the
MSEC shall be checked as described in 4.6.8.1.1.
Step 3.
Repeat step 1.
Step 4.
Repeat step 2.
Step 5.
Repeat step 1.
Step 6. Repeat step 2. Twenty minutes after transfer, the tests of 4.6.7.3 and 4.6.7.6 shall be performed. The
MSEC shall be returned to ambient temperature and shall pass the tests specified in 4.6.8.
4.6.8.2 Vibration. To determine conformance to 3.5.2, the MSEC shall be mounted in its production installation
configuration or equivalent. The vibration level shall be in accordance with figure 5, applied in 15 minute sweep times
in accordance with figure 7. Resonant search and dwell of 30 minutes at each of the four most severe resonant
frequencies shall be part of the total cycle time of 3 hours. The MSEC shall pass the tests specified in 4.6.8 during
exposure.
4.6.8.3 Shock. To determine conformance to 3.5.3, the MSEC shall be mounted in its production installation
configuration or equivalent and exposed to the shock pulses defined in 3.5.3 three times in each of three mutually
perpendicular axes. The MSEC shall be monitored for false discharges during the test. The MSEC shall pass the
tests specified in 4.6.8 after exposure.
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