MIL-T-52953C APPENDIX
TEST METHOD NO. 1
RELIABILITY TEST
1. Test course:
a. Layout of course. The test course shall be set up equivalent to the provisions of figure 1. The course perimeter shall be demarcated with suitable barriers or indicators. Rubber pylons or other suitable marking shall be placed on all corners and other critical points to assist in keeping the truck being tested within the course limits.
b. Obstacle inclusion. The obstacle test shall be set up in accordance with the provisions of figure 2 or figure 3 as applicable, as a part of the test course. Iron, wood, cement, or steel blocks may be used. A guideline 15 feet long shall be provided to the left of the centerline of the course and parallel to it. The inner edge of this guideline shall be at a distance from the course centerline equal to one-half of the truck width or one-half of the load width (whichever is greater) plus 6 inches. This spacing and arrangement will allow the left wheels of the truck under test to pass over the first block and than the right wheels to pass over the second block while the truck is moving forward in a straight line parallel to the guideline.
c. Ramp inclusion. The course shall include a ramp constructed in accordance with the provisions of figure 4.
d. Course surface. The course shall be paved with concrete having a fine float finish, or equivalent, having a road resistance of approximately 30-50 pounds per ton. It shall be dry, clean, and free of any nonplanned obstacles or foreign material while conducting the reliability test.
e. Pallet areas. Pallet loads in the first pallet area shall be stacked in accordance with figure 5 or figure 6 as applicable. They shall be placed 2 inches apart in a direction parallel to, and touching in a direction perpendicular to the axis of the test course at that point. Side pallet stacks shall be high enough that the bottom of the top face of the top pallet in each stack is 6 inches below the maximum lift height of the vehicle under test. The stack marked "X" on
figure 1 shall be high enough that the bottom of the top face of the pallet, when placed upon it, shall be 6 inches below the maximum lift height of the vehicle under test. Pallet loads in the second pallet area shall be stacked in accordance with figure 7 or figure 8 as applicable. They shall be placed 2 inches apart in a direction parallel to, and touching in a direction perpendicular to the axis of the test course at that point. Side pallet stacks shall be high enough so that the bottom of the top pallet will be approximately as high as the maximum lift height of the truck under test. The stack marked "Y" on figure 1 shall be high enough that the bottom of the
top face of the pallet, when placed upon it, shall be at the midpoint between ground level and the maximum lift height of the vehicle under test. Pallet loads in the third pallet area shall be stacked in accordance with figure 9. They shall be placed 2 inches apart, positioned as shown on figure 1, in a direction parallel to, and touching in a direction perpendicular to the axis of the test course
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