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|  MIL-M-70542 (AR)
The MBD shall remain at this temperature for a minimum period of
three hours. The temperature of the chamber shall be gradually
reduced (see above rate of temperature change) to minus 40 degrees C.
The MBD shall remain at this temperature for a minimum of three hours.
At the completion of this period and while at minus 40 degrees C,
the MBD locating block shall be depressed three times and observed to
return to its original position each time. Failure of the locating
block to return to its original position at the operating temperature
minus 40 degrees C and plus 65 degrees C constitutes failure of the
test. Upon completion of this test the temperature of the test
chamber shall be gradually reduced (see above rate of temperature
change) to minus 62 degrees C. The MBD shall remain at this tem-
perature for a minimum period of three hours.
The temperature chamber shall be gradually raised (see above rate
of temperature change) to ambient temperature plus 15 degrees to plus
32 degrees C. Note: Tolerance on constant temperature is plus or
minus 2.8 degrees C. The MBD shall be removed and subjected to the
examination and tests in Table II.
4.7.10.2 Vibration (secured cargo). The cased MBD shall be
vibrated in accordance with Test Method 514.2, Procedure X, Curve AV,
Equipment Category G of MIL-STD-810, Vibration shall be applied
along each of three mutually perpendicular axes of the MBD. Vibrating
equipment capable of providing the test level and frequency ranges
specified in the above test mehtod shall be utilized for this test.
Unless otherwise specified, the test equipment shall be in accordance
with the "Test Facilities" requirements of MIL-F-13926. The MBD shall
be removed and subjected to the examination and tests in Table II.
4.7.10.3 Shock. The MBD shall be shocked in accordance with Test
Method 516.2, procedure I, Figure 516.2-2, time duration 11 millise-
conds, of MIL-STD-810, except that the peak acceleration shall be 40
g's. The MBD shall be removed from the shock fixture and subjected to
the examination and tests in Table II.
4.7.10.4 High temperature. Subject the MBD to the high tem-
perature test specified in MIL-STD-810. Method 501.1, Procedure I.
The highest operating temperature shall be plus 71 degrees C. The
performance tests of Table II shall be applied.
4.7.10.5 Low temperature. Subject the MBD to the Low temperature
test specified in MIL-STD-810 Method 502.1, Procedure I. The
storage temperature shall be minus 62 degrees C. The lowest operating
temperature shall be minus 40 degrees C. The performance tests of
Table II shall be applied.
4.7.10.6 Temperature cycling. The rate of temperature change in
the test chamber shall not exceed 10 degrees C per hour throughout the
temperature cycling test of 4.7.10.1. The performance tests of Table
II shall be applied.
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