MIL-PRF-62494D(AT)
4.3.2 Materials, design, and construction. Conformance to 3.2 through 3.2.4 shall be
determined by inspection of contractor records providing proof or certification that design,
construction, processing, and materials conform to requirements.
4.3.3 Inspection conditions. Unless otherwise specified (see 6.2), all inspections shall be
conducted under the following standard (room) ambient conditions:
a. Temperature: 77 + 18°F (25° + 10°C)
b. Relative humidity: uncontrolled room ambient
c. Atmospheric pressure: site pressure.
4.4 Operating requirements verification.
4.4.1 Damping resistance. To determine conformance to 3.3.1, the shock absorber shall
be mounted in a suitable test fixture by means of the self-aligning bearings and shall be cycle
tested in rebound and compression. During testing, the compression and rebound damping
resistance at various piston velocities shall be measured. The number of measurements taken shall
be of sufficient quantity to establish that the damping resistance to the shock absorber is within
the limits specified in table I. Temperatures shall be measured on the surface of the shock
absorber at the lower end of the reservoir. Cycle rates and temperature ranges for first article,
shall be as specified.
4.4.2 Compression and tension loading. To determine conformance to 3.3.2, the shock
absorber shall be mounted in a suitable test fixture by means of self-aligning bearings and shall be
loaded with not less than 40 000 lb (18 144 kg) in compression and not less than 40 000 lb
(18 144 kg) in tension without damage to any of its components. Damage to any of the
components shall constitute failure of the test.
4.4.3 Endurance. To determine conformance to 3.3.3, the shock absorber shall be
mounted in a suitable test fixture by means of the self-aligning bearings and shall be tested for not
less than 600 000 cycles using a 3 +0.125 in. (76 +3 mm) stroke at a piston velocity necessary to
produce a continuous fluid reservoir surface temperature of 350° to 400°F (177° to 204°C).
External cooling may be provided as required. External leakage during testing shall be no greater
than 15 percent of the reservoir fluid when the shock absorber is fully collapsed. Following
testing no more than 25 percent change in damping resistance as measured prior to the start of
testing shall constitute failure. When the damping resistance measurements are taken, the fluid
reservoir surface temperature shall be 300° to 400°F (149° to 204°C).
4.4.4 Bearing rotational torque. Using any method for measuring bearing rotational
torque (see 4.3), verify that the torque required to rotate the upper and lower spherical races at
3 to 5 rpm conforms to the values specified in 3.3.4. Torque above or below these specified
values shall constitute failure.
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