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|  MIL-M-48640 (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 temperature 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. NoteL 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.
4.7.9.2 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-81O. 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 method 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.
4.7.9.3 Shock. The MBD shall be shocked in accordance with
Test Method 516.2, Procedure I, Figure 516.2-2, Time Duration 11
milliseconds, of MIL-STD-81O, 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.
4.7.9.4
High temperature. Subject the MBD to the high
temperature
test specified in MIL-STD-81O, Method 501.1, Procedure I.
The highest
operating temperature shall be plus 71 degrees C. The
performance
tests of Table II shall be applied.
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