MIL-DTL-48559B
FIGURE 1. Orientation of shock loads.
3.4.4 Vibration "A". The mount shall withstand a total of 270 ± 5 minutes of
sweep-cycle vibration. The vibration shall be applied for 90 ± 2 minutes along each of the
three mutually perpendicular major axes shown in Figure 1. A complete sweep-cycle shall
consist of vibration from origin (5 Hz at 1 inch double amplitude) to mid-point (5 ± 0.5 g's
at 500 Hz) to origin, and shall have a duration of 15 ± 1 minutes. Double amplitude shall
be constant at 1 inch between 5 Hz and 10 Hz, and varied with frequency to maintain a
constant 5 ± 0.5 g's acceleration between 10 Hz and 500 Hz. Upon completion of
vibration, the mount shall exhibit no evidence of damage or physical failure and shall meet
the requirements of 3.5 through 3.10 inclusive.
3.4.5 Vibration "B". The mount shall be vibrated in the vertical plane shown in
Figure 1 for a total of 15 ± 1 minutes of sweep cycle vibration. A complete sweep-cycle
shall consist of vibration from origin (5 Hz at 1 inch double amplitude) to mid-point (5 ±
0.5 g's at 500 Hz) to origin, and shall have a duration of 15 ± 1 minutes. Double amplitude
shall be constant at 1 inch between 5 Hz and 10 Hz and varied with frequency to maintain a
constant 5 ± 0.5 g's acceleration between 10 Hz and 500 Hz. Upon completion of
vibration, the mount shall exhibit no evidence of damage or physical failure and shall meet
the requirements of 3.5 through 3.10 inclusive.
3.5 Alignment of locating surfaces.
3.5.1 Mounting surfaces for M18A1 quadrant. The mounting surface for the
quadrant shall be parallel to the mounting surface of the mount within 1 minute of arc (0.3
mil).
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