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|  MIL-M-70742 (AR)
3.2 Materials. Materials shall be in accordance with
drawings, material specifications and general specifications
forming a part of this specification.
3.3 Fabrication. The Mount shall be manufactured in
accordance with Drawing F12599166 and drawings pertaining thereto.
3.4 General specification. The contractor shall be
responsible for adherence to the requirements of MIL-F-13926.
3.5 Environmental.
3.5.1 Operatinq temperature. The mount shall meet the
applicable requirements of 3.6.3 to 3.6.6.1 inclusive while
exposed and thermally stabilized at ambient temperatures of +60
degrees Fahrenheit (F) to + 90 degrees Fahrenheit. The mount
shall then meet the requirements of 3.6.5 at +150 degrees and -50
degrees Fahrenheit, subsequent to which the mount shall meet the
requirements of 3.5.4.
3.5.2 Storage temperature. The mount shall show no evidence
of physical failure and shall meet all requirements of this
specification at standard ambient temperature (+60 degrees to + 90
degrees Fahrenheit) after having been and thermally stabilized at
ambient temperatures of +160 degrees F and -80 degrees F for a
period of 6 hours at each temperature extreme.
3.5.3 Shock. The mount shall withstand a total of 18 shock
implusesr three in each direction of three mutually perpendicular
axis. Each shock impulse shall be a half-sine wave with a time
duration of 3 + 1 milliseconds.
3.5.4 Vibration.
3.5.4.1 Vibration "A". The mount shall withstand a total of
270 minutes + 5 minutes of sweep-cycle vibration. The vibration
shall be applied for 90 minutes + 2 minutes along each of three
mutually perpendicular major axis. A complete sweep-cycle shall
consist of vibration from origin (5hz at 1 inch double amplitude)
to mid point (5g's + 0.5 g's at 500 hz) to origin, and shall have
a duration of 15 minutes + minutes. Double amplitude shall be
constant at 1 inch between 5 hz and 10 hz and varied with
frequency to maintain a constant 5 g's + 0.5 g's acceleration
between 10 hz and 500 hz. Upon completion of vibration the mount
shall exhibit no evidence of damage.
3
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