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|  MIL-M-485559A(AR)
3.7.1 Storage temperature. The mount shall show no evidence
of physical failure when thermally stabilized at ambient
0
0
0
0
temperatures of +l60 F (71 c) 5 F (3 C) and -50F (-46C) 5F
0
{3 C) for a period of 6 hour 15 minutes at each temperature.
Subsequent to return to room temperarure (see 3.7) the system
shall not have been damaged and shall meet the requirements of 3.8
through 3.9.
3.7.2 Operating temperature. The mount shall meet the
applicable requirements of 3.9 while exposed and thermally
stabilized 0 3 hours 15 minutes at an ambient temperature of +150F
0
0
(+65 C) 5 F (+3 C) and exposed and thermally stabilized 3 hours 15
minutes at ambient temperature of -50F (-46C) 5F (+3C). Upon
return to standard ambient temperature, +60F to +90F (16C to
32C), from each operating temperature, the mount shall meet the
requirements of 3.8 thru 3.9.
3.7.3 Shock. The mount shall withstand a total of 18 shock
impulses, three in each direction of three mutually perpendicular
axix. Each shock impulse shall be a half-sine wave with a time
duration of 3 1 millisecond. The peak amplitude of each shock
impulse shall be 100 g's. Subsequent to shock, the mount shall
show no evidence of physical damage and shall meet the
requirements of 3.8 thru 3.9.
3.7.4
Vibration.
3.7.4.1 Vibration "A". When required, the mount shall
withstand a total of 270 minutes 5 minutes of sweep-cycle
vibration. The vibration shall be applied of 90 minutes 2
minutes along each of the three mutually perpendicular major axes.
A complete sweep-cycle shall consist of vibration from origin (5
hz at 1 inch double amplitude) to midpoint (5 g's 0.5 g's at 500
hz) to origin, and shall have a duration of 15 minutes +1 minute.
Double amplitude shall be constant at 1 inch between 5 hz and 10
hz, and varied with a 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 and shall
meet the requirements of 3.8 thru 3.9.
3.7.4.2 Vibration "B". The mount shall be vibrated in a
vertical plane at a constant frequency of 30 cycles per second
with an amplitude of 1/16 inch (1/8 inch total excursion) for a
period of five minutes plus or minus 15 seconds. Subsequent to
vibration there shall be no evidence of physical failure and the
mount shall meet the requirements of 3.8 thru 3.9.
3.8
Performance.
3.8.1 Cross level adjustment. The mount shall travel
through an excursion of at least 34 degrees to the left and 34
degrees to the right from the position established in 3.5.
4
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