MIL-PRF-62494D(AT)
4.4.5 Axial load. To determine conformance to 3.3.5, an axial load through the bearing
of 2000 lb (907 kg) shall be applied to the inner bearing shell, first in one direction and then in the
opposite direction. Following testing, movement of the self-aligning bearing from its installed
location or permanent deformation shall constitute failure.
4.4.6 Angular velocity. To determine conformance to 3.3.6, a radial load of 6000 lb
(2722 kg) shall be applied to the self-aligning bearing. Bearing shall stay in its installed location.
One cycle equals 130 degrees of total angular motion.
4.5 Interface requirements verification.
4.5.1 Vehicle systems testing. Sixteen preproduction shock absorbers shall be used for
vehicle testing. Eight shock absorbers shall be installed on each of two test vehicles which shall
be operated for 6000 miles (9656 km) each and shall approximate conditions of initial production
tests. Tests shall include 1260 miles (2028 km) of paved roads, 2700 miles (4345 km) of
secondary roads and 2040 miles (3283 km) of cross country roads. Each shock absorber shall be
baseline tested in accordance with 4.4.1 before vehicle testing to assure conformance to the
requirements of 3.3.1. After completion of 6000 miles (9656 km), the damping resistance test
specified in 4.4.1 shall be repeated. Performance more than 25 percent below the minimum
requirements of 3.3.1 shall constitute failure of the test (see 3.4.1).
4.5.2. Interchangeability. To determine conformance to 3.4.2, use one or more of the
methods outlined in 4.3 and 4.3.1 to verify that the shock absorbers are interchangeable with
other manufacturer's shock absorber.
4.6 Support and ownership requirements verification.
4.6.1 Bearing. To determine conformance to 3.5.1 use one or more of the methods
outlined in 4.3 and 4.3.1 to verify that the shock absorber meets the performance requirements.
4.6.2 Reliability requirements. The shock absorber shall meet the requirements specified
in 3.5.2 during vehicle testing. The reliability calculation shall be based on the total accumulated
shock absorber test miles before failure divided by the total number of shock absorbers tested.
Failure is defined as shock absorber replacement required because of the inability to perform its
required function. A shock absorber shall be considered a failure if one or more of the following
conditions exist (see 3.5.2):
a.
External leakage.
b.
Little or no increase in surface temperature after cross country operation.
c.
Severe bearing wear.
d.
Loss of more than 25 percent of minimum damping resistance (see 3.3.1).
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