MIL-DTL-48557B
FIGURE 1. Orientation of shock loads on M171A1 mount.
FIGURE 2. Orientation of shock loads on M137A2 Panoramic Telescope.
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
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