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|  MIL-C-52980B
Step 6. Push the test car toward the buffer car(s) and, by using the locomotive speedometer or
other means, release the test car when the desired test speed is reached, thus allowing the test car
to freely impact the buffer car(s).
Step 7. Repeat step 6 until the test car(s) has impacted the buffer car three times at the same
end, once each at speeds of 6.4, 9.7 and 13.0 km/h (4, 6, and 8 mph) +0.8, -0.0 km/h. Reverse
the test car and repeat the 13.0 km/hr impact, for a total of 4 impacts.
NOTE: Adjustment of the lading or securing mechanisms, or reconditioning of the bracing or
items of securement is not allowed without a complete retest.
Step 8. Repeat steps 1-7 for any other shipping orientation.
Step 9. Record the pertinent information for each impact, to include the following:
a.
Complete test item identification.
b.
The number and speed of impact.
c.
Observations of tiedown, blocking, fittings, etc.
d.
Observations of the test item's physical condition.
e.
Results of any operational checks.
NOTE: Any impacts below the required test speeds shall be repeated. Impacts above the
required test speeds shall be accepted providing the following requirements are satisfied.
A test item shall be classified as not having survived the rail impact test and will be deemed a
test failure if any item that is attached to or included as an integral part of the test item breaks
free, loosens or shows any signs of permanent deformation. Retesting shall be accomplished
with new tiedown material to eliminate additive effect and, if possible, a new test item.
4.5.2.21.2 Tiedown provisions. The tiedown provisions shall be tested in accordance with
MIL-STD-209 to prove conformance to 3.24.6.4. Inability to meet the requirements of 3.24.6.4
shall constitute failure of this test.
4.5.2.21.3 Slinging provisions. The slinging provisions shall be tested in accordance with
MIL-STD-209 to prove conformance to 3.24.6.5. Inability to meet the requirements of 3.24.6.5
shall constitute failure of this test.
4.5.2.21.4 Air transportability. The air transportability requirement for the C-130 and C-141
aircraft in accordance with MIL-STD-1791 (see 3.24.6.3) shall be certified. Inability to provide
certification shall constitute failure for meeting this requirement.
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